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op-

1.
variant of ob- (by assimilation) before p:
oppose.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for op-

assimilated form of ob- before -p-.

Online Etymology Dictionary, © 2010 Douglas Harper
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Difficulty index for op-

Few English speakers likely know this word

Word Value for op

4
5
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