(transitive) To hit someone with a car or other vehicle and injure or kill them. / (transitive) To criticize someone or an organisation, often unfairly.

(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.

(idiomatic) Thoroughly practiced, rehearsed, or understood; mastered.

(intransitive) To become less excited, intense, or angry. / (transitive) To cause to become less excited, intense, or angry.

(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).

(transitive) To make (something) lower (especially of clothes). / (transitive) To demolish or destroy (a building etc.). / (transitive) To cause to fall to the floor

simple past tense and past participle of round down