transitive. To impart liveliness, vividness, or interest to; to enliven.

transitive. To brighten or cheer, to animate; to bring energy and interest into.

Chiefly with up. Now chiefly North American. transitive. To make more lively, sharp, clever, or aware; to brighten or sharpen up.

To render more animated or striking.

transitive. Of an expression or emotion: to cause (the eyes, face, etc.) to appear more lively or animated. Frequently in passive.