(chiefly US, idiomatic, derogatory) A person who is cowardly or indecisive. / (chiefly US, idiomatic) A person or thing which is the least robust or least dependable member of a group.

(slang, vulgar) Extremely weak.

plural of weak sister

Alternative form of weak-kneed

The weak nuclear force.

(physics) The fundamental interaction responsible for the weak nuclear force.

plural of weak verb

(grammar) One of a class of Germanic verbs which use a dental affix appended to the stem to indicate tense; a Germanic weak verb.

A form of copyleft where not all derived works inherit the copyleft licence.

Used other than figuratively or idiomatically: see weak, tea. / Weak (feeble) effort or proposal; unconvincing argument.