1
on one's forearm
（名词）指前臂；on one's forearm 表示“在某人的前臂上”，forearm 可作可数名词，常用物主代词修饰。
He has a tattoo on his forearm.
他前臂上有一处纹身。
前臂
先理解核心含义，再看它在真实句子里的用法。
前臂
the part of the arm between the elbow and the wrist
He has a tattoo on his forearm.
他前臂上有一处纹身。
前臂
The part of the arm between the wrist and the elbow.
上肢肘与腕之间的部分
the part of the superior limb between the elbow and the wrist
护木(枪械上用于握持稳定的部分)
A section of the weapon between the receiver and the muzzle, used to hold the firearm steady.
She placed her forearm on the pillow to ease the pain.
她把前臂放在枕头上以减轻疼痛。
The bracelet slipped down his forearm.
手镯滑到他的前臂上。
After lifting weights, my forearms were trembling.
举重之后，我的前臂在发抖。
（名词）指前臂；on one's forearm 表示“在某人的前臂上”，forearm 可作可数名词，常用物主代词修饰。
He has a tattoo on his forearm.
他前臂上有一处纹身。
（动词）意为预先武装、提前准备；forearm oneself with sth 表示“用某物让自己预先做好准备”，后接宾语和 with 介词短语。
She forearmed herself with facts before the debate.
她在辩论前用事实做好了准备。
（动词被动式）be forearmed with sth 表示“事先以某物做好应对准备”，强调已准备就绪的状态。
The negotiator was forearmed with statistics for the meeting.
谈判人员事先用统计数据为会议做好了准备。
Not this
He has two forearm.
Use this
He has two forearms.
forearm 是可数名词，表示“前臂”；汉语没有复数变化，英语中“两只/两只以上前臂”要用复数 forearms。因此 two 后接复数形式。
Not this
She forearmed for the exam.
Use this
She prepared for the exam.
forearm 作动词时是及物动词，意为“预先武装/使有准备”，不能单独接 for 表示“为考试做准备”；应为 prepare for。此错误源于混淆动词词性与固定搭配。
Not this
He felt a pain in his forearm, near the shoulder.
Use this
He felt a pain in his upper arm, near the shoulder.
forearm 仅指肘部到腕部的前臂；靠近肩部的部位是上臂 (upper arm)。汉语中“前臂/上臂”常混称“手臂”，这里用 near the shoulder 限定部位，应改用 upper arm。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
左前臂
He has a tattoo on his left forearm.
他左前臂上有一个纹身。
前臂骨折
She suffered a forearm fracture in the fall.
她摔倒时前臂骨折了。
前臂肌肉
Grip training strengthens the forearm muscles.
握力训练能增强前臂肌肉。
前臂损伤
The tennis player withdrew due to a forearm injury.
那位网球选手因前臂损伤而退赛。
前臂骨
The radius and ulna are the forearm bones.
桡骨和尺骨是前臂骨。
有备无患
Read the instructions first — forewarned is forearmed.
先读说明书——有备无患。
有备无患；凡事预则立
We can't prevent every mistake, but forewarned is forearmed.
我们无法避免每一个错误，但有备无患。
事先掌握……并做好准备
Be forearmed with all the facts before you make an accusation.
在提出指责之前，先掌握所有事实并做好准备。
有备无患。
This proverb, echoed in many movies and novels, means that early warning gives you the same advantage as a soldier having a shield before battle.
这句谚语在许多电影和小说中被引用，意思是提前得到警告就像士兵上战场前有盾牌一样占优势。
Use forearm naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
fore（前）+ arm（手臂）：手臂靠前的一段就是前臂，记住fore在前，前臂就在肘和腕之间。
语域：neutral 常见场景：anatomy class、clinic、gym 作为名词表示“前臂”时，通常用于医学、解剖或身体活动等场景，语气中性，在正式和非正式场合都比较常见。
These words all contain the spelling '-arm'. 'arm', 'farm', 'harm', 'charm', and 'alarm' rhyme with the '-arm' part of 'forearm' (/ɑrm/): their stressed vowel and following sounds match. 'warm' is a useful spelling lookalike but is pronounced /wɔrm/, so it does not rhyme.
Dictionary facts from ECDICT, WIKTIONARY.