(idiomatic) At full speed; very quickly.

(idiomatic) Very loudly; as loudly as (vocally) possible.

(baseball) An opportunity to hit. / (baseball) official at-bats. Batting opportunities minus walks, hit by pitches, and sacrifices

Anxious; unsure; uneasy. / Uncomfortable.

(informal) Something that is decent, acceptable, or worthwhile.

(software) Initialism of assistive technology. / (US, Navy) Initialism of auxiliary tugboat. / (US, sports) Initialism of anaerobic threshold. / (fan fiction) Initialism of alternate timeline.

(military) Initialism of anti-tank.

(euphemistic, Scotland) To practise coitus interruptus, the withdrawal method of contraception. / Used other than figuratively or idiomatically: see get, off, at, Haymarket.

(obsolete) In one group; together. / At the same time; simultaneously. / Immediately; now; right away.

(idiomatic) Unexpectedly; without warning; all of a sudden. / Used other than figuratively or idiomatically: All at the same time; all together.