overextend

From over- +‎ extend.

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overextend (third-person singular simple present overextends, present participle overextending, simple past and past participle overextended)

1. To expand or extend to an excessive degree, especially to do so beyond a safe limit; to overreach.
2. (linguistics, transitive) To apply (a term) to too many referents, by overextension.
3. (chess, transitive) To push a pawn too far, so that it becomes vulnerable to the opponent's attacks.

• overextended