Crossword Genius

Crash the baby shower (4)

Ross

I believe the answer is:

bump

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'crash' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for bump that I've seen before include "Jostle" , "Jolting movement or skin swelling" , "Knock - collide" , "Evidence of pregnancy - knock (into)" , "Slight collision" .)

I've seen this clue in The Independent.
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