Used other than figuratively or idiomatically: see cut, down. / (transitive) To bring down by cutting. / (idiomatic, transitive) To insult, to belittle. / (idiomatic) To reduce the amount of something.

(idiomatic) wasted or irretrievable.

(physics) A quark having a fractional electric charge of -1/3 and a mass of about 4 to 8 MeV. / Symbol: d

(physics) the antiparticle of a down quark

(computing) A dynamic menu; a list of options in a computer application which appears below a heading when it is selected, and remains only as long as the user needs it.

That can be pulled down (lowered).

(mathematics) Of a real number, converted to an integer by having its fractional component removed.

simple past tense and past participle of round down

(idiomatic) To wait; to stop pursuing, stop fighting, or relax from a heightened readiness posture. / (transitive, intransitive) To withdraw or retire from a position or from a team.

a street leading off Whitehall in Westminster, London containing the residences of the Prime Minister and the Chancellor of the Exchequer / (metonymically, by extension) the British government