A polite way of responding to thanks, by suggesting that the service is too trivial or humble to warrant thanks; you're welcome. / Used other than figuratively or idiomatically: see don't, mention, it.

(idiomatic, often humorous) Somewhat sarcastic but usually good-natured advice used to criticise a person's degree of talent (especially in music or other performing arts), implying that he or she could not make a living from it.

(Britain) A type of thick jacket, usually dark blue, often worn by men who work outside (though originally worn by donkeymen)

(of meat etc) Cooked until no blood runs and there is no pink flesh on the inside.

(idiomatic) Easy to propose, but difficult to accomplish.

(medicine) A person with blood type O, which lacks antigens and is therefore compatible with all other blood types, allowing them to donate blood to any other person.

(informal) A pumpjack.

(idiomatic) Hard, boring, routine work.

(US, dated) Do not permit yourself to be cheated or duped; do not be naive.

simple past tense and past participle of do a bunk