1. counterarm - Noun
2. counterarm - Verb
counterarm (third-person singular simple present counterarms, present participle counterarming, simple past and past participle counterarmed)
To arm oneself in order to match the level of weaponry held by an opponent.
A weapon that is acquired in order to counter one held by an opponent.
A weighted arm, or an arm that holds a weight, which acts as a counterbalance.
(astronomy) A galactic arm on the far side of a galaxy that is colliding with another galaxy.
Source: en.wiktionary.org