fastday禁食日fast——noun[C]aperiodoftimewhenyoueatnofood禁食期；斋戒期H

fast day 禁食日

fast——noun [ C ]

a period of time when you eat no food 禁食期；斋戒期

Hundreds of prisoners began a fast in protest about prison conditions.

数百名犯人开始绝食，抗议监狱条件太差。