Meaning:
1. fuss, fret, worry, get worked up
2. busy, busily, work hard with little rest, slave away

Usage Example:
1. 小さなことにあくせくするなよ。(Don’t fuss about small things!)
2. 日本人にほんじんは朝から晩まであくせく働く。(Japanese people work hard morning to night)

Variations:
齷齪あくせく