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rule US English

One of a set of explicit or understood regulations or principles governing conduct within a particular activity or sphere

divide and conquer US English

The policy of maintaining control over one’s subordinates or subjects by encouraging dissent between them

Rule 43 US English

(In the UK) a prison regulation whereby prisoners, typically sex offenders, can be isolated or segregated for their own protection

em rule US English

A long dash (—) used in punctuation

en rule US English

A short dash (-) used in punctuation, in particular between figures to show a range (for example, 1939–45)

self-rule US English

Another term for self-government111.

foot rule US English

A foot-long measuring instrument

gag rule US English

A regulation or directive that prohibits public discussion of a particular matter, in particular

home rule US English

The government of a colony, dependent country, or region by its own citizens

mob rule US English

Control of a political situation by those outside the conventional or lawful realm, typically involving violence and intimidation

phase rule US English

A rule relating the possible numbers of phases, constituents, and degrees of freedom in a chemical system

plumb rule US English

A plumb line attached to a board, used by builders and surveyors

as a rule US English

Usually, but not always

rule-bound US English

Overly limited or restricted by rules

direct rule US English

A system of government in which a province is controlled by a central government

slide rule US English

A ruler with a sliding central strip, marked with logarithmic scales and used for making rapid calculations, especially multiplication and division

golden rule US English

A basic principle that should be followed to ensure success in general or in a particular activity

ground rule US English

A basic principle

indirect rule US English

A system of government of one nation by another in which the governed people retain certain administrative, legal, and other powers

majority rule US English

The principle that the greater number should exercise greater power

rule of law US English

The restriction of the arbitrary exercise of power by subordinating it to well-defined and established laws

selection rule US English

A rule that describes whether particular quantum transitions in an atom or molecule are allowed or forbidden

Simpson's rule US English

An arithmetical rule for estimating the area under a curve where the values of an odd number of ordinates, including those at each end, are known

trapezium rule US English

A method of estimating the area under a curve by dividing it into a series of strips, each of which is approximately a trapezium

rule of thumb US English

A broadly accurate guide or principle, based on experience or practice rather than theory

rule the roost US English

Be in complete control

rule of three US English

A method of finding a number in the same ratio to a given number as exists between two other given numbers

exclusionary rule US English

A law that prohibits the use of illegally obtained evidence in a criminal trial

Chatham House Rule US English

A rule or principle according to which information disclosed during a meeting may be reported by those present, but the source of that information may not be explicitly or implicitly identified

rule something out US English

Exclude (or include) something as a possibility

rule of engagement US English

A directive issued by a military authority specifying the circumstances and limitations under which forces will engage in combat with the enemy

rule of the road US English

A custom or law regulating the direction in which two vehicles (or riders or ships) should move to pass one another on meeting, or which should yield to the other, so as to avoid collision

en passant rule US English

The rule that a pawn making a first move of two squares instead of one may nevertheless be immediately captured by an opposing pawn on the fifth rank

fifty-year rule US English

A rule that public records may be open to inspection after a lapse of fifty years. Superseded in the UK in 1968 by the thirty-year rule

thirty-year rule US English

A rule that public records may be open to inspection after a lapse of thirty years

ten-minute rule US English

A rule of the House of Commons allowing brief discussion of a motion to introduce a bill, each speech being limited to ten minutes

as a general rule US English

In most cases

as a rule in rule US English

Usually, but not always

rule of law in rule US English

The restriction of the arbitrary exercise of power by subordinating it to well-defined and established laws

rule something out in rule US English

Exclude (or include) something as a possibility

Fleming's left-hand rule US English

A mnemonic concerning the behavior of a current-carrying conductor in a magnetic field, according to which the directions of the magnetic field, the current, and the force exerted on the conductor are indicated respectively by the first finger, second finger, and thumb of the left hand when these are held out perpendicular to each other

Fleming's right-hand rule US English

A mnemonic concerning the behavior of a conductor moving in a magnetic field, according to which the directions of the magnetic field, the induced current, and the motion of the conductor are indicated respectively by the first finger, second finger, and thumb of the right hand when these are held out perpendicular to each other

rule of thumb in rule US English

A broadly accurate guide or principle, based on experience or practice rather than theory

the exception proves the rule US English

The fact that some cases do not follow a rule proves that the rule applies in all other cases

en passant rule in en passant US English

The rule that a pawn making a first move of two squares instead of one may nevertheless be immediately captured by an opposing pawn on the fifth rank

divide and conquer in divide US English

The policy of maintaining control over one’s subordinates or subjects by encouraging dissent between them

rule the roost in rule US English

Be in complete control

make it a rule to do something US English

Have as a habit or general principle to do something

the rule in rule US English

The normal or customary state of things


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