clench one's fist
collocation握紧拳头
He clenched his fist in frustration.
他沮丧地握紧拳头。
咬紧；紧闭
clenching — present participle of clench
先理解核心含义，再看它在真实句子里的用法。
咬紧；紧闭
To close tightly.
He clenched his teeth in anger.
他愤怒地咬紧牙关。
紧握或抓住
To grip or hold fast.
紧闭
To close tightly.
clench
Base
原形
clenches
3rd person
第三人称单数
clenching
-ing
现在分词
clenched
Past
过去式
clenched
Past participle
过去分词
I clench my fists when I'm angry.
我生气时紧握拳头。
He clenched his jaw in frustration.
他沮丧地咬紧牙关。
She is clenching her handbag strap nervously.
她紧张地紧握着手提包带子。
规则动词，过去式和过去分词加-ed。
She clenched her fists when she heard the bad news.
听到坏消息时，她握紧了拳头。
The child clenched the toy tightly in his hand.
孩子把玩具紧紧攥在手里。
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握紧拳头
He clenched his fist in frustration.
他沮丧地握紧拳头。
咬紧牙关
She clenched her jaw and said nothing.
她咬紧牙关，什么也没说。
咬紧牙齿
He clenched his teeth to stop shivering.
他咬紧牙齿以免发抖。
攥紧双手
I clenched my hands under the table.
我在桌子下面攥紧双手。
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记忆联想：clench 与 clasp、close 同以 cl- 开头，都有“合拢、抓牢”的感觉——握紧拳、咬紧牙。
语域：neutral 常见场景：日常对话、小说/影视描写、新闻报道 clench 表示“握紧”或“咬紧”时在口语和书面语中都较常用，属于中性表达；通常搭配 fist、teeth、jaw 等具体对象，使意思更明确。正式学术文体中较少单独使用。
常与fist, jaw, teeth等搭配，表示紧握或咬紧。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY, WORDNET.