- 1under or below something else, especially when it is hidden or covered by the thing on top The coin rolled underneath the piano. This jacket's too big, even with a sweater underneath.
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- 2used to talk about someone's real feelings or character, as opposed to the way they seem to be Underneath her cool exterior she was really very frightened. He seems grumpy, but he's very soft-hearted underneath.
Check pronunciation: underneath