to speak for itself
01
to be so clear or obvious that no further explanation is needed
例
The quality of the product speaks for itself; the reviews are overwhelmingly positive.
製品の品質は自ずと明らかである ; レビューは圧倒的に肯定的です。
Her impressive performance really spoke for itself during the job interview.
彼女の印象的なパフォーマンスは、就職面接中に本当にそれ自体が物語っていた。
