A device consisting of a bar or wheel with a set of angled teeth in which a pawl, cog, or tooth engages, allowing motion in one direction only
A type of small flick knife popular in Jamaica.
A hypothetical mechanism having the effect of invariably increasing the number of harmful mutations in a population of asexually reproducing organisms, since genotypes with the fewest harmful mutations will be among those lost at random in an irreversible manner (likened to a ratchet).
An effect whereby a trend or tendency in cost, demand, etc., is maintained incrementally so that it becomes, or appears to become, irreversible; also in extended use.
Cause something to rise (or fall) as a step in what is perceived as an irreversible process