Definitions from Wiktionary (forestall)

▸ verb:  (transitive) To prevent, delay or hinder something by taking precautionary or anticipatory measures; to avert.
▸ verb:  (transitive) To preclude or bar from happening, render impossible.
▸ verb:  (archaic) To purchase the complete supply of a good, particularly foodstuffs, in order to charge a monopoly price.
▸ verb:  To anticipate, to act foreseeingly.
▸ verb:  To deprive (with of).
▸ verb:  (UK, law) To obstruct or stop up, as a road; to stop the passage of a highway; to intercept on the road, as goods on the way to market.
▸ noun:  (obsolete or historical) An ambush; plot; an interception; waylaying; rescue.
▸ noun:  Something situated or placed in front.

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