To openly show your emotions or feelings.
自分の感情や気持ちをオープンに示すこと。 (Jibun no kanjō ya kimochi o ōpun ni shimesu koto.)
"He wears his heart on his sleeve, so you always know how he feels."
"彼は心を袖に出している、だから彼がどう感じているかはいつでもわかる。" (Kare wa **kokoro o sode ni dashite iru**, dakara kare ga dō kanjite iru ka wa itsu demo wakaru.)
to increase effort or commitment toward something
to surprise someone with something unexpected
I swear or promise sincerely.
to make a serious promise or pledge
a simple and perfect solution to a complex problem
to respond angrily or sharply to someone