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Definition

To figure out; to realize the truth.

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In Context

  • "I was planning it as a surprise, but I think he is on to me."
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See Also

  • catch on to
  • cotton on to
  • be on
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Related Idioms

b

be there

To be available to provide comfort and support for someone, especially…

 b

be mother

To pour out tea for others.

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be left holding the baby

To be left with the responsibility of resolving a problem.

 b

be my guest

Do as you wish; go ahead; help yourself; go for it!

 b

be in for

To be able to expect or anticipate; to be about to suffer, generally s…

 b

be that as it may

Even if that is the case; whether that is true or not; nevertheless.
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