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general::
Phrase(s): use something before something
1. to consume or use something before using something else. • Use this jar before that one. This one is older. • I used the old one before the one you just bought. 2. to consume or use something before a specified date. • I will use this bottle of catsup before May. • You should use this one before the date stamped on the bottom.
McGrawhill's American Idioms And Phrasal Verbs