why and wherefore

Noun

(set phrase, often pluralized) A full and complete explanation.

Japanese Meaning

完全な説明 / 徹底した解説 / 全体を網羅する理由の説明

She demanded the why and wherefore of his sudden resignation.

彼女は彼の突然の辞任の理由と詳しい説明を求めた。

Sense（1）

(set phrase, often pluralized) A full and complete explanation.

whys and wherefores

（ plural ）