Definition: To display one's feelings openly and habitually rather than keeping them private.情感外露，袒露心情Origins: In the Middle Ages, Emperor Claudius II believed unattached men made better soldiers so he declared marriage illegal. As a concession, he encouraged temporary coupling. Once a year, during a Roman festival honoring Juno, men drew names to determine who would be their lady friend for the coming year. Once established, the man would wear her name on his sleeve for the rest of the festival.ALSOAround that same time, it's speculated, when a knight performed in a jousting match in the king's court, he'd dedicate his performance to a woman of the court. By tying something of hers, like a handkerchief, around his arm, he'd let the court know the match would defend the honor of that woman.OR, we can credit Shakespeare, where it may have first been recorded in writing