wear your heart on your sleeve
US /wer yʊr hɑrt ɑn yʊr sliv/
UK /wer yʊr hɑrt ɑn yʊr sliv/
1.
to openly show your emotions rather than hiding them
:
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She tends to wear her heart on her sleeve, so you always know how she's feeling.
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As an actor, it's important to be able to wear your heart on your sleeve and convey genuine emotion.