Heart on your sleeve
Meaning
Show your emotions openly.
Usage
Compliments or criticizes emotional transparency.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Knights wore their lady’s colors on their sleeves during tournaments.
Appears in Shakespeare’s Othello and other early English texts.