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Meaning

without sleeping a wink

Without sleeping at all; staying awake through the night.

Example

合否の連絡が気になって、まんじりともせず夜を明かした。

Anxious to hear whether I had passed, I spent the night without sleeping a wink.

Origin

Manjiri is an adverb describing a brief doze, and with a negative it emphasizes not sleeping a wink. In the Agency for Cultural Affairs survey for fiscal Heisei 25 (2013), the meaning considered original, "without sleeping," was chosen by 28.7%, and "without moving" by 51.5%, so the two had reversed.

Sources