An archaic or obsolete form meaning to rave, wander in mind, or speak deliriously; to act in a wild or uncontrolled manner.
From Old French delirer or similar medieval forms, ultimately from Latin delirare (to deviate from the furrow), combining de- (away) and lira (furrow in a field), originally describing someone plowing off course mentally.
The Latin root 'lira' (furrow) gives us 'delirium'—someone delirious is mentally 'off the furrow,' as if their mind stopped following the straight path and started wandering wildly instead, a brilliant metaphor from agriculture.
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