blend (something) in

blend (something) in

To mix or combine something smoothly or seamlessly with something else. Be sure to blend your makeup in so that your face isn't two different colors. OK, now blend the butter in with the eggs.
See also: blend

blend in (to something)

to combine nicely with something; to mix well with something. The oil won't blend into the water very well. It simply won't blend in.
See also: blend