Meanings
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1
prep
To a position on top of or on the surface of something.
My cat just jumped onto the keyboard.
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2
prep
Aware of or having discovered (someone's secret or plan).
The police were onto his plan within days.
Thesaurus
Word family
Derived forms
thereontowhereonto
Etymology
From on + to, after into. Compare Saterland Frisian antou (“up to”).