teeth arm
n.— «The six main “teeth” arm units were augmented by soldiers from 10 other regiments. The commander of 7th Armoured Brigade, who is a 5th Inniskilling Dragoon Guard, had his tank manned by men from his own regiment.» —“Army’s System No Longer Suited To Today’s Battlefields” Independent (U.K.) June 10, 1991. (source: Double-Tongued Dictionary)
Further reading
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...
There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...