blend in

Verb

 * 1)  To add (an ingredient) by mixing or blending.
 * You have to blend in the eggs very slowly.
 * 1)  To fit unnoticed into the surroundings.
 * He disguised himself as a businessman to blend in with the others wearing suits.
 * The aliens adopted human form in order to blend in.
 * The aliens adopted human form in order to blend in.