night and day

Idioms

Also day and night. Continually, without stopping. This phrase is used either literally, as in The alarm is on night and day, or hyperbolically, as in We were working day and night on these drawings. Shakespeare put it by night and day in The Comedy of Errors (4:2): “Time comes stealing on by night and day.”

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A 30-year-old Chinese seafarer on a vessel waiting to sail into the Persian Gulf describes, night and day, seeing missiles and drones flying overhead.

From The Wall Street Journal • Apr. 5, 2026

"The difference between now and 10 years ago is like night and day,", said Tin Oo, a motorbike taxi driver in Yangon's industrial district of Hlaing Tharyar.

From BBC • Apr. 2, 2026

The ice lid contracts and expands with temperature fluctuations between night and day, opening cracks that fill with shards of newly frozen lake water.

From Barron's • Feb. 15, 2026

“Converting a building from 1990 versus one from 2010 is night and day due to the differences in code eras.”

From Los Angeles Times • Feb. 11, 2026

For all her exposure to ideology she had no interest in politics and no idea of the schemes that occupied her husband night and day.

From "Invisible Man" by Ralph Ellison

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023