Jisho

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Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)
1. poor at preventing one's opponent from getting an underarm gripSumo
Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)
2. having weak defenses; off one's guard; vulnerable (to attack)Idiomatic expression
Other forms
わきが甘い 【わきがあまい】ワキが甘い 【ワキがあまい】

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