different as night and day
Also, different as day and night. Totally unlike. For example, Although they are sisters, they are as different as night and day. Also see night and day.
Why Do Brits And Americans Spell Words Differently?Brits and Americans may share a mother tongue, but when it comes to spelling a handful of common terms, we just can't seem to settle on a shared favorite—or is it favourite?—approach.
Is It “Different From” Or “Different Than”?Both different from and different than are accepted in standard American English, and both have been in use for the last 300 years. But is one of these phrases more correct than the other? In formal writing, different from is generally preferred to different than. This preference has to do, in part, with the historical use of the word than. This term entered English as …
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.