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

 

stock up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

stock somethingup

 
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to fill something with goods, food, etc. We need to stock up the freezer.

stock up (on/with something)

 
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to buy a lot of something so that you can use it later We ought to stock up on film before our trip.
See the Oxford Advanced Learner's Dictionary entry: stock up