1882, "over-talkative," from slack-jaw (n.) "impertinent language" (1797), from slack (adj.) + jaw (n.). Meaning "open-mouthed and speechless" from astonishment, stupidity, etc., is from 1905.
双语例句
1. Many publishers have simply become far too slack.
许多出版商就是变得过于懈怠了。
来自柯林斯例句
2. The boy's jaw went slack.
男孩张大了嘴巴。
来自柯林斯例句
3. She was staring into space, her mouth slack.
她双唇微张，失神地望着前方。
来自《权威词典》
4. Slack off those ropes there ; there's a storm coming!
把那里的绳索放松, 暴风雨就要来了!
来自《简明英汉词典》
5. Please slack up your speed. I can't run as fast as you!
