mix in

WORDNET DICTIONARY

mix in(v = verb.change) blend 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

mix in(v = verb.change) mix - add as an additional element or part; "mix water into the drink"

is one way to add

Sample sentence:
Somebody ----s something