(now rare) To give vent (to), to let loose (unrestrained feelings, emotions etc.).

past participle of give it some welly

(idiomatic, intransitive or transitive) To respond to an insult, accusation, or falsehood by saying the offender is lying, particularly in the context of provoking a challenge to a duel.

(idiomatic) To attach importance to. / (idiomatic) To improve the credibility or legitimacy of.

(idiomatic) Something with continuous (typically positive) consequences. / (slang) A sexually transmitted disease.

(idiomatic) To forgo something.

To sacrifice something valuable.

Alternative form of give one's eye-teeth

To cause pain to someone. / (idiomatic) To hassle or abuse someone.

(slang) To care; mind; consider important.