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
Is there such a thing as a “neutral” accent, and if so what does it sound like? And that quirk in the way southern Californians talk about freeways. They’ll say things like take the 405 and get on the 8. Why the definite article...
Floordrobe is the new word for an old habit: piling your clothes on the floor instead of putting them away. The Oxford English Dictionary recently added an entry for it, defining floordrobe as “an untidy heap of discarded clothing left on the floor...