Definition of blend in phrasal verb from the Oxford Advanced American Dictionary

 

blend in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

blend in (with something/somebody)

 
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if something blends in, it is similar to its surroundings or matches its surroundings Choose curtains that blend in with your decor. The thieves soon blended in with the crowd and got away.

blend somethingin

 
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(in cooking) to add another substance and mix it in with the others Beat the butter and sugar; then blend in the egg.
See the Oxford Advanced Learner's Dictionary entry: blend in