AT ONCE, straight away, (right) now, this (very) minute, this instant, immediately, instantly, directly, forthwith, without further ado, promptly, quickly, without delay, a.s.a.p., as soon as possible; N. Amer. in short order; informal straight off, p.d.q. (pretty damn quick), pronto; N. Amer. informal lickety-split.
2192; headword