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general::
Phrase(s): stock up (with something)
to build up a supply of something. • You had better stock up with firewood before the first snowstorm. • Yes, I will stock up today., Phrase(s): stock up (on something)
to build up a supply of something in particular. • I need to stock up on food for the party. • We need fresh vegetables. We will have to stock up before the weekend.
McGrawhill's American Idioms And Phrasal Verbs