1. Without delay or hesitation; with no time intervening
   "If you want to make it to class on time, you better leave tout de suite";
   - immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, like a shot [informal], right now, right off the bat [N. Amer, informal], instantaneously, outright, in a flash

See also: then and there