The process of expressing or making outward something that was internal or hidden, like showing your feelings on your face.
From exterior (Latin exterius 'outer') + -ize (Greek -izein 'to make or do'). The suffix -ize was added to exterior in English to create a verb meaning 'to make exterior.'
This word captures what happens when you try to hide emotions but your face gives you away—you're 'exteriorizing' your internal state. It's the opposite of the poker face!
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