time will tell

time will tell idiom
Sooner or later something will become known or be revealed, as in I don't know whether or not they'll like the reconstruction; only time will tell. This proverbial phrase dates from the early 1500s.

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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