To move suddenly and unsteadily in a particular direction, often losing balance.
Origin uncertain, possibly from nautical terminology where 'lurch' described a ship's sudden sway. It may also relate to an old word for 'lurk,' suggesting sudden unexpected movement.
A ship lurching in rough seas and a drunk person lurching down the street use the exact same word because both describe that stomach-dropping moment when your body suddenly tilts and you're not sure if you'll regain balance.
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