Synonyms of 'on'
on top ofDictionary, supported by, resting on
He sat beside her on the sofa.
on top of
in contact with
2 continuously, for a long time, at length
She chattered on brightly and aimlessly for several minutes.
for a long time
They spoke at length, reviewing the entire incident.
without a break
idiomson and off
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Thesaurus for on from the Collins English Thesaurus