goof off 偷懒；游手好闲；无所事事

【例句】

The students were told not to goof off during the exam preparation period.
学生们被告知在考试准备期间不要偷懒。

He was caught goofing off at work, and his boss was not happy about it.
他在工作中偷懒被抓到，他的老板对此很不高兴。