たがが緩む
Expression- 1to weaken (of willpower, solidarity, etc.) ; to lose one's edge ; to become less tense ; to become lax (of discipline, rules, etc.) Translated by Jiyomi
Other writings and readings
タガが緩む箍が緩むタガがゆるむ
expressions (phrases, clauses, etc.) · Godan verb with 'mu' ending
JMdict entry 2833545. Source and licence.