wear one's heart on one's sleeve (wear wan's heart on wan's sleeve)

Idiom Compassion

意味

to openly show emotions or feelings

感情や気持ちを公然と示す (kanjou ya kimochi wo kouzen to shimesu)

例文

"He tends to wear his heart on his sleeve when it comes to helping others."

"彼は他の人を助けるときに自分の感情を公然と示す傾向があります。" (Kare wa hoka no hito wo tasukeru toki ni jibun no kanjou wo kouzen to shimesu keikou ga arimasu)