forearm (n.)youdaoicibaDictYouDict[forearm 词源字典]
between the elbow and the wrist, 1741, from fore- + arm (n.1).[forearm etymology, forearm origin, 英语词源]
forearm (v.)youdaoicibaDictYouDict
"prepare for an attack," 1590s, from fore- + arm (v.) "take up weapons." Related: Forearmed; forearming.