Glossary /// Alias
Mão de vaca defence
Also known as Wristlock Escape — the canonical term used on this site.
Portuguese — “cow’s hand”, the Brazilian name for the wristlock
Mão de vaca defence is the Brazilian name for wristlock defence, using the Portuguese term that predominates in Brazilian academies and in Brazilian-lineage no-gi vocabulary.
Etymology. Mão de vaca translates literally as “cow’s hand” — a wry description of the bent, splayed shape a wrist takes when the lock is applied. The phrase is also Brazilian slang for a miser, which is part of the joke; the grappling sense is purely descriptive of the hand position.
Mechanics. Wrist locks need a bent wrist and a short lever, so a closed fist with a straight wrist denies both. Once the wrist is captured, withdrawing and re-anchoring the elbow to the body shortens the lever the attacker is working, and stacking the knuckles is the late option that relieves flexion.
Cross-reference. Full escape coverage on Wristlock Escape, which sets out the fist-and-straight-wrist discipline the whole defence rests on.