noun
rear toe pick
A sumo technique where the attacker hooks the opponent's rear toe from the outside, often used as a last-ditch move at the edge of the ring.
土俵際で小褄取りを決めて逆転勝ちした。
He won by reversal with a rear toe pick at the edge of the ring.
褄 refers to the skirt or hem of a kimono; in sumo, it metaphorically indicates the toe area of the foot.
Compound of 小 (ko, 'small') + 褄 (tsuma, 'skirt/hem', here referring to the toe area) + 取り (tori, 'taking'). The reading こづまとり reflects rendaku (voicing of つま to づま).