A chiefly British variant spelling of 'enjail,' meaning to put someone in jail or prison.
From prefix 'en-' (to cause to be) plus 'gaol,' the British spelling of 'jail' (from Old French 'gaole'). This spelling preserves the historical French pronunciation even though modern usage prefers 'enjail' or just 'jail.'
The British spelling 'gaol' for 'jail' is a classic example of how spelling and pronunciation can drift apart over centuries—the Normans brought the French word to England, and the British kept the fancy spelling even though it sounds nothing like it looks!
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