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Your forearm is the lower part of your arm, from the elbow down to the hand. If you bend your elbow, the forearm is the piece that moves. Doctors use the word, and so do ordinary people talking about a cut, a muscle, or a watch. Fore- here means the front or nearer part of the arm, not the upper part near the shoulder. Though actually, the same spelling can also be a verb meaning to prepare someone with weapons or facts before trouble comes, but that use is less common and is not this body-part sense.
前臂（手肘到手腕這一段）
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
forearmnoun/ˈfɔːˌɹɑːm/
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anatomymedicinesciencesThe part of the arm between the wrist and the elbow.
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engineeringfirearmsgovernmentA section of the weapon between the receiver and the muzzle, used to hold the firearm steady.
forearmverb/ˌfɔːˈɹɑːm/
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To arm in preparation.
- But in so far as they were able to forearm themselves against the anxieties of bereavement, the loss may have been that much easier to face.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。