: to look like things nearby
The fish settles on the sandy ocean bottom where it blends in perfectly.
: to look like one belongs with a particular group
She tried to blend in by dressing like the other girls.
—often + with I've always found it difficult to blend in with my peers.
: to add (something) to a mixture or substance and mix it thoroughly
Mix the first three ingredients together, then blend in the cream. Blend the white paint in last.
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