能ある鷹は爪を隠す（のうあるたかはつめをかくす）

Japanese vocabulary

Meaning: a wise man keeps some of his talents in reserve; one shouldn't show off; the person who knows most often says least; a skilled hawk hides its talons

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “能ある鷹は爪を隠す” pronounced in real videos (YouGlish)