Crossword Genius

Exclamation to startle (3)

Ross

I believe the answer is:

boo

'exclamation to startle' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for boo that I've seen before include "I disapprove" , "causing surprise!" , "get off!" , "I hated that!" , "Make one's dislike heard" .)

I've seen this clue in The Irish Times.
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