1. Ichidan verb, Intransitive verb

   1.

   to be clear (of a sight, sound, colour, etc.); to be bright; to be vivid; to be crisp

2. 2.

   to be clear-headed; to be alert; to be on the ball; to be wide awake

3. 3.

   to look upbeat; to be perky; to be cheerful

Example sentences

• コーヒーを一杯飲むと頭が冴える。

  I feel more alert after drinking a cup of coffee.