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Synonyms

night and day

Idioms  

  1. 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.

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

“Anybody who has flown on a Starlink-equipped aircraft will say it was night and day between anything they experienced in the past,” Quilty said.

From MarketWatch • Feb. 11, 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

The difference is night and day, said Sgt.

From The Wall Street Journal • Dec. 13, 2025

Workers began to occupy this particular flat-building night and day.

From "Interpreter of Maladies" by Jhumpa Lahiri

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.