different as night and day

different as night and day idiom
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.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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