(US, slang) The police.

(US, colloquial) murder in the first degree.

(idiomatic) First; foremost; best, often used after its headword.

The most important person, the one who is in charge. / Someone who is top of a ranking, who is ranked first. / Oneself, being considered foremost, as by an egoist.

(soccer) A quick one-touch play between two players. / (boxing) A one-two punch; two punches delivered in rapid succession / Two things in short succession

(In both the 12-hour clock and the 24-hour clock) The start of the second hour of the day; 1:00 a.m. (01:00). / (Only in the 12-hour clock) The start of the fourteenth hour of the day; 1:00 p.m. (13:00).

In a situation which is entirely suitable, familiar, or enjoyable.

(idiomatic) Attentive, active, busy or alert.

(snowboarding) A trick with one foot free from the bindings; instead it is placed beside the rear binding and boned far away from the board during airtime.

Having only a single eye, particularly when a greater number is normal. / Being able to see out of only one eye.