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
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