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In theory an animal could pick up and go, defying all the social conventions and boundaries proper to its species. However, such an event is less likely to happen.
How would you native speakers interpret 'pick up and go' here?
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Hi,
Leave abruptly

Clive
Comments  
Students: We have free audio pronunciation exercises.
OK. Thanks, Clive.
Is it a set-phrase?  
Hi,
Yes.
Clive