To change the form or structure of something, making it into a different shape or form.
From re- (again) + shape (from Old English sceap 'form'). A straightforward compound that emerged in Middle English.
Reshape is one of those words that perfectly shows how re- works in English—it literally just means 'to shape again.' But metaphorically, 'reshape' is what humans do all the time to their ideas, careers, and lives when things need to change.
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