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be on to

Be aware of or have information about, as in They can't pull that trick again; we're on to them now. [ ; second half of 1800s ]
Discover something important or profitable, as in The researchers claim they are really on to something big. [ ; mid-1900s ]
The American HeritageĀ® Idioms Dictionary
Copyright Ā© 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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