also: まんじりともせず
expression
not sleeping a wink; wide awake all night
Used in negative constructions to emphasize that one did not sleep at all, often with 一晩中 or 夜通し.
昨夜はまんじりともしなかった。
I didn't sleep a wink last night.
彼は一晩中まんじりともせずに考え事をしていた。
He stayed wide awake all night thinking.
expression
without moving; without stirring
Colloquial use, often in negative form to mean staying completely still, as in まんじりとも動かない.
猫はまんじりとも動かずに鳥を見つめていた。
The cat stared at the bird without moving a muscle.