An archaic or dialectal verb meaning to frustrate, thwart, or prevent something from happening.
From Latin 'frustrare' (to deceive or disappoint), related to 'frustra' (in vain). This shortened form appears occasionally in Middle English texts but is now obsolete.
We still use 'frustrate' today, but our ancestors had 'frust' as a quicker way to say it—language constantly sheds old short forms in favor of newer ones!
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