blend in

WORDNET DICTIONARY

blend in(v = verb.stative) blend, go - blend or harmonize; "This flavor will blend with those in your dish"; "This sofa won't go with the chairs"

is one way to accord, agree, concord, consort, fit in, harmonise, harmonize

Sample sentences:
Something ----s
Something is ----ing PP

blend in(v = verb.change) mix in - cause (something) to be mixed with (something else); "At this stage of making the cake, blend in the nuts"

is one way to blend, coalesce, combine, commingle, conflate, flux, fuse, immix, meld, merge, mix

Sample sentence:
Somebody ----s something

VB blend in, blend into the background, lie in ambush, lie in wait for, lurk, set a trap for, ambuscade, ambush, camouflage.

For further exploring for "blend in" in Webster Dictionary Online