Definition of squash up phrasal verb from the Oxford Advanced American Dictionary

 

squash up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

squash up (against somebody/something)

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squash somebody/somethingup (against somebody/something)

 
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to move so close to someone or something else that it is uncomfortable I was squashed up against the wall.
See the Oxford Advanced Learner's Dictionary entry: squash up