dawn (up)on (one)

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dawn (up)on (one)

To occur to one, especially very suddenly or unexpectedly. Once I pulled up to the bank, it dawned on me that I had forgotten my wallet. Did it just dawn on you that throwing the ball in the house might be a bad idea, or did you have that realization before breaking mom's vase?
See also: dawn
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

dawn (up)on someone

Fig. [for a fact] to become apparent to someone; [for something] to be suddenly realized by someone. (Upon is formal and less commonly used than on.) Then it dawned upon me that I was actually going to have the job. On the way home, it dawned on me that I had never returned your call, so when I got home I called immediately.
See also: dawn, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

dawn on

Also, dawn upon. Become evident or understood, as in It finally dawned on him that he was expected to call them, or Around noon it dawned upon me that I had never eaten breakfast. This expression transfers the beginning of daylight to the beginning of a thought process. Harriet Beecher Stowe had it in Uncle Tom's Cabin (1852): "The idea that they had either feelings or rights had never dawned upon her." [Mid-1800s]
See also: dawn, on
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.

dawn on

or dawn upon
v.
To begin to be perceived or understood by someone; become apparent to someone: It dawned on me that I had forgotten to pick up some milk. A possible motive for the crime dawned upon the detective.
See also: dawn, on
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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