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 . [Colloquial; second half of 1800s] Discover something important or profitable, as in The researchers claim they are really on to something big . [Colloquial; mid-1900s]
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chivalry... these fellows may be on to something.'I would paraphrase this sentence in one of these ways: