be on to
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English[edit]
Pronunciation[edit]
Audio (AU) (file)
Verb[edit]
be on to (third-person singular simple present is on to, present participle being on to, simple past was on to, past participle been on to)
- (idiomatic) To figure out; to realize the truth.
- I was planning it as a surprise, but I think he is on to me.