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What does "on" mean?
and so on
and more like the preceding; and so forth
have something (or nothing) on someone
âInformal to have some (or no) unfavorable evidence against someone
on and off
not continuously; intermittently
on and on
continuously; at great length
on to
âSlang aware of or familiar with, esp. aware of the real nature or meaning of
See on in American Heritage Dictionary 4 Idioms
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