Dictionary / Vocabulary / 理性のタガ
りせいのたが · also りせいのタガ
the bounds of reason; the limits of (common) sense
Also written 理性の箍、理性のたが
普段はとてもおとなしいナイスガイだが、理性のタガがはずれると人格が豹変する二重人格。
He's got a dual personality - usually a quiet "nice guy" type, but when he flips, his character changes.
たまには理性のタガを外してみませんか。
Why not just let fly once in a while?