or ~to
1.
If something blends into the background, it is so similar to the background that it is difficult to see or hear it separately.
The toad had changed its colour to ~ with its new environment.
...a continuous pale neutral grey, almost blending into the sky...
PHRASAL VERB: V P with n, V P n
2.
If someone blends into a particular group or situation, they seem to belong there, because their appearance or behaviour is similar to that of the other people involved.
It must have reinforced my determination to ~to my surroundings...
She felt she would ~ nicely...
He blended in with the crowd at the art sale.
PHRASAL VERB: V P n, V P, V P with n