Definition

Knowing; wide awake; fully understanding another's meaning. [Slang] Dickens.

Other Definitions

This word also has 2 other definitions:

FLY (noun)

1. Any winged insect; esp., one with transparent wings; as, the Spanish fly; firefly; gall fly; dragon fly. 2. Any dipterous insect; as, the house fl...

FLY (verb)

1. To move in or pass thorugh the air with wings, as a bird. 2. To move through the air or before the wind; esp., to pass or be driven rapidly throug...