Synonyms

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.

McGinn says the difference between the expectations then and now is night and day.

From BBC • Mar. 30, 2026

They relish one relaxing night and day before they are interrupted by a late-night knock on the door.

From The Wall Street Journal • Mar. 4, 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

But what I gather from what Mother writes me now is that she works night and day wearing a horrid white coat in some dreary big-deal place in Atlanta where they study disease organisms.

From "The Poisonwood Bible" by Barbara Kingsolver

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