There are 2 definitions of flex in English:

flex1

Line breaks: flex
Pronunciation: /flɛks
 
/

verb

1(With reference to a limb or joint) bend or become bent: [with object]: she saw him flex his ankle and wince [no object]: it’s important to prevent the damaged wrist from flexing
More example sentences
  • All these bones articulate with other bones and are able to make tiny interdependent movements, as well as bend or flex themselves.
  • Over the last few days I've been thinking about all the things I won't be able to do with the limb; flex my ankle, wiggle my toes, point my foot left and right.
  • As you flex your ankles, knees and hips, the angle of your front shin with the ground should match the angle of your spine with the ground.
Synonyms
1.1 [with object] Cause (a muscle) to stand out by contracting or tensing it: a group of bodybuilders flexed their muscles
More example sentences
  • They stood before them, flexing their godly muscles.
  • But it is eerily impressive, like watching a brilliant young bodybuilder flexing his steroidal muscles.
  • Loveable cartoon character Popeye always flexes his biceps when he wants to show off his muscles.
Synonyms
tighten, tauten, make taut, tense (up), tension, contract, stiffen, brace, knot
1.2 [no object] (Of a muscle) contract or be tensed: a muscle flexed in his jaw
More example sentences
  • End the movement with the dumbbell over your upper chest and with your pec muscles flexed as hard as possible.
  • He was still standing there when she went back into her room, his arms crossed, the thick muscles of his biceps flexing.
  • Jim's jaw muscle flexed and he continued to unwrap the shirt bits from Blair's arm.
1.3 [no object] (Of a material) be capable of warping or bending and then reverting to shape: set windows in rubber so they flex during an earthquake
More example sentences
  • Over time, as the boot leather flexes, stiffness decreases.
  • An experienced player can tell by the stick's vibration whether or not the stick flexes too much.
  • A collective puff of expelled breath flexed through the courtyard, liberated pirates rubbing their eyes to be certain the welcome, if not morbid, sight was real.
2 (as adjective flexed) Archaeology Relating to or denoting a practice of burying a corpse with the legs drawn up under the chin.
More example sentences
  • They did, however, think the skeletons looked very unusual, being very highly flexed, like Peruvian mummies.
  • Despite the length of the pit, the proximity of these articulated extremities and the ilium shows that the primary burial was in a flexed position prior to disturbance.
  • Some adults and children were subject to secondary processing after initial burial in flexed or extended positions in pits located inside the house.

Origin

early 16th century: from Latin flex- 'bent', from the verb flectere.

Phrases

flex one's muscles

see muscle.

Definition of flex in:

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous

There are 2 definitions of flex in English:

flex2

Line breaks: flex
Pronunciation: /flɛks
 
/

noun

British
A flexible insulated cable used for carrying electric current to an appliance.
More example sentences
  • Reading Crown Court was told that she took an electric flex intending to throttle the ripper.
  • They had tied an electrical flex around the door to stop anyone entering.
  • There was an electrical flex across the landing and the girl could have easily fallen down the stairs.
Synonyms
cable, wire, lead, extension; North Americancord

Origin

early 20th century: abbreviation of flexible.

Definition of flex in: