To poison, envenom. Also figurative.

gen. To injure, do harm or mischief to; to affect injuriously, be prejudicial or detrimental to; to wrong, inflict injury upon.

transitive. To impair fatally, spoil, ruin (an enterprise, achievement, ability, intention, emotion, etc.). Often paired in proverbial antithesis…

transitive. To make worse, less valuable, weaker, or less; to injure, damage, weaken; to impair, v.

transitive. To make worse, less valuable, or weaker; to lessen injuriously; to damage, injure.

With immaterial object. Obsolete or dialect.

transitive (a) To damage, injure, maim. (b) to deface, disfigure.

transitive. To render dull; to blunt, weaken; to deprive of sanity.

To mar, spoil, or injure the working of.

transitive. To impair, injure, dilapidate.

To make bad; to pervert in character or quality; to deteriorate, impair, spoil, vitiate. Now rare, except as in 2.

transitive. To mar the appearance, beauty, or excellence of; to make ugly or unsightly; to disfigure, deface. figurative.

To infuse venom or bitterness into (actions, relations, etc.); to impart bitterness to (the feelings or words of a person); to embitter, make…

transitive. To render incomplete, imperfect, or faulty; to impair or spoil.

To spoil, impair; to overpower, destroy, put an end to. transitive. With a thing as object. Also (occasionally) intransitive. Now Caribbean: to…

To hinder the action, progress, or well-being of; to affect detrimentally or prejudicially; to hurt, harm, injure, endamage, impair. Obsolete.

transitive. Originally: to impair the functioning of (an organ); to alter (a normal physiological or a pathological process), usually injuriously…

figurative. To destroy the soundness of, impair, ruin; to ruin financially, render bankrupt. (Usually in passive.) Obsolete or archaic.

transitive. To infect with pernicious, noxious, corrupting or deleterious qualities; to touch with putrefaction; to corrupt, contaminate, deprave.

With immaterial object: to affect injuriously or detrimentally, esp. to an irretrievable extent; to… Of things or actions.

To damage, injure (reputation, health, welfare); to injure, prejudice, discredit (a cause, etc.).

transitive. To affect adversely; to injure, impair. Obsolete.

figurative. To impair the beauty or excellence of. Obsolete.

To damage (something immaterial) so that it can never again be sound; to ruin virtually.

transitive. In extended use: to spoil, corrupt (a thing). Obsolete.

To affect injuriously; to injure, endamage.

transitive. To render vicious; to corrupt, spoil.

To spoil (anything) in quality. a thing not material: To spoil, mar. archaic.

To embitter; = envenom, v. 2b.

transitive. To render poor, to impoverish; to reduce in quality, vigour, or capacity.

transitive. To cause loss or damage to; to damage, injure, hurt.

with immaterial object, or figurative.

transferred and figurative. To take away the excellence of; to corrupt, impair, vitiate.

(un-, prefix2 affix 1b.)

transitive. To spoil (music, writing, etc.) through lack of skill or poor execution.

transitive. To break up; to impair. Obsolete.

To lower or bring down in force, vigour, activity, intensity, or amount; to render weaker or less; to render dull or languid.

transitive. To make (a person's brain, etc.) confused or lose the ability to think clearly; to muddle; (also) to prevent (an action, etc.) from…

transitive. To cause to waste away like a guttering candle. Chiefly figurative.

figurative. transitive. To ruin (something) intentionally or through incompetence; esp. to spoil (language, a creative work, etc.) by alteration…

In occasional figurative uses. To obscure, dim the lustre of (good qualities).

transitive. To make a mess of; to disorder, make dirty or untidy; to cause to be spoiled by inept handling; to muddle, mishandle. Now usually with up…

transitive. To break, destroy, ruin; to kill. Cf. puckeroo, adj., puckerooed, adj.

transitive. To deprive of tone.

transitive. To spoil, ruin; = blow, v.1 9e.

transitive. To put out of order; to spoil. Also: to spoil the reputation or chances of (a person); to put (a person) out of favour (with another).

transitive. To damage (something); to ruin, spoil; to destroy. Cf. to dick up at phrasal verbs 1.

transitive. To destroy, corrupt.