wear one's heart on one's sleeve
idiom

- to show one's feelings clearly and openly by one's behavior

(The American Heritage Dictionary)

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EXPRESSIONS WITH HEART

Some idioms and figures of expression, such as "wear one's heart on one's sleeve," paint a clear picture of the meaning. The heart, which is associated with emotion, is in clear view for everyone to see when it's worn on the sleeve.

There also people who "have their heart in the right place," meaning they are a good and kind person even if they do not always seem to be. Such people also might be characterised as having "a heart of gold." In contrast, some people "have a heart of stone," which implies that they are emotionally cold and unfriendly.

A person with a heart of stone could suddenly "have a change of heart," meaning they changed their attitude or a decision, usually from a negative to a positive position. This can happen as a result of a "heart to heart" (a serious discussion with another person) or after "pouring their heart out" (to tell someone your secret feelings and worries, usually because you feel a strong need to talk about them).

But some people are just stubborn and instead "have their heart set against" changing their mind, despite the fact that the other person probably did it "out of the goodness of their heart" (simply because one is kind).

But whoever said humans are simple? The task of trying to change someone's mind is often "not for the faint of heart" (not suitable for people who become frightened easily). It's better to "put your heart and soul" into it (to do something with a lot of energy and interest) rather than doing it "half-hearted."

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Practice OWAD in a conversation:

"She's the sort of person who WEARS HER HEART UPON HER SLEEVE."

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Thanks to Roman and Martina for suggesting today's word!