Webster's Revised Unabridged Dictionary · 1913

make believe

make believe , intransitive verb

To pretend; -- often used with that, but often having the that omitted; as, he made believe he didn't hear her; or he made believe that he didn't hear her.

make-believe , noun

A feigning to believe, as in the play of children; a mere pretense; a fiction; an invention.
Childlike make-believe. — Tylor
To forswear self-delusion and make-believe. — M. Arnold

Make-believe , adjective

1.
Feigned; insincere.
Make-believe reverence. — G. Eliot
2.
Imaginary; as, the child had a make-believe friend to whom he often talked.