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Burn one's boats destroy one's means of retreat, do something which makes it impossible to return to an earlier state; the term is recorded (in figurative use) from the late 19th century.

burn the candle at both ends draw on one's resources from two directions; especially, overtax one's strength by going to bed late and getting up early. The expression is recorded in English from the mid 18th century, but is found earlier in French.

burn the midnight oil read or work late into the night, supposedly by lamplight; a related image is found in the expression smell of Chancery.

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