Definition of come preposition from the Oxford Advanced Learner's Dictionary

 

come

 preposition
preposition
BrE BrE//kʌm//
 
; NAmE NAmE//kʌm//
 
 
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(old-fashioned, informal) when the time mentioned comes They would have been married forty years come this June. Come next week she’ll have changed her mind. Word Origin Old English cuman, of Germanic origin; related to Dutch komen and German kommen.
See the Oxford Advanced American Dictionary entry: come