Definition of psst exclamation from the Oxford Advanced Learner's Dictionary

 

psst

 exclamation
exclamation
BrE BrE//pst//
 
; NAmE NAmE//pst//
 
 
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the way of writing the sound people say when they want to attract somebody’s attention quietly Psst! Let's get out now before they see us! More Like This Exclamations aargh, ah, aha, ahchoo, ahem, aw, bah, boo, coo, d’oh, eek, eh, er, eww, gee, ha, hey, ho ho, ho-hum, hooray, huh, mm, oh, oho, oi, ooh, oops, ouch, ow, oy, pah, phew, psst, sh, tsk tsk, tut, ugh, uh, uh-uh, uh-oh, um, whoopee, whoops, woo hoo, wow, yay, yippee, yuck, yumSee worksheet. Word Origin 1920s: imitative.
See the Oxford Advanced American Dictionary entry: psst