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have a retch
have a retch 表示一次干呕的动作，相当于动词 retch 的具体一次性表达。
He had a retch but brought up nothing.
他干呕了一下，但什么也没吐出来。
干呕
先理解核心含义，再看它在真实句子里的用法。
干呕
An unsuccessful effort to vomit.
He had a retch but brought up nothing.
他干呕了一下，但什么也没吐出来。
干呕；未成功的呕吐动作
An unsuccessful effort to vomit.
After eating the spoiled food, he experienced a sudden retch but brought up nothing.
吃了变质的食物后，他突然一阵反胃，但什么也没吐出来。
The loud retch from the next room made everyone cringe.
隔壁房间传来响亮的呕吐声，让所有人都皱起了眉头。
She felt a retch coming on and quickly excused herself from the table.
她感到一阵反胃，赶紧离开了餐桌。
have a retch 表示一次干呕的动作，相当于动词 retch 的具体一次性表达。
He had a retch but brought up nothing.
他干呕了一下，但什么也没吐出来。
with a retch 在句中作伴随状语，说明动作伴随着干呕。
She turned away with a retch.
她干呕一声，转过身去。
stifle a retch 意为忍住干呕，属于“动词+宾语”结构，stifle 也可换成 suppress。
He stifled a retch and continued talking.
他忍住干呕，继续说话。
Not this
He gave retch when he saw the blood.
Use this
He gave a retch when he saw the blood.
retch 作名词时是可数名词，单数前需要加不定冠词 a，所以 "gave retch" 缺少冠词，应改为 "gave a retch"。
Not this
The smell made me let out a wretch.
Use this
The smell made me let out a retch.
wretch（可怜的人）与 retch（干呕）同音，但意思完全不同；此处要表达“干呕”，必须拼写为 retch。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
干呕；空呕
He gave a dry retch but brought nothing up.
他干呕了一下，但什么也没吐出来。
响亮的干呕声
A loud retch from the hallway startled everyone.
走廊里传来响亮的干呕声，吓了大家一跳。
剧烈的干呕
She felt a violent retch as the smell hit her.
闻到那股气味时，她感到一阵剧烈的干呕。
一连串的干呕
The patient was left weak after a series of retches.
一连串的干呕让病人虚弱不堪。
不自主的干呕
An involuntary retch escaped him at the sight.
看到那景象，他不自主地干呕了一下。
Use retch naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
retch 读起来像干呕时喉咙憋出的“呃”声，一“呃”就是干呕。
语域：neutral 常见场景：medical descriptions、symptom reports、narrative writing 作为名词，retch 多用于描写呕吐前或未呕出的动作，常见于医疗描述和症状叙述；日常口语中更常说 dry heave。整体语气比较中性。
这些词都与 retch 的 /e/ + /tʃ/ 押韵：fetch, etch, sketch, stretch, wretch, ketch。注意 wretch 与 retch 发音完全相同，只是多写一个 w；拼写相似的 reach /riːtʃ/ 和 watch /wɒtʃ/（美式 /wɑːtʃ/）发音不同，不要混淆。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.