ˈlight on ˈlight upon [transitive] [present tense I/you/we/they light on he/she/it lights on present participle lighting on past tense lit on past participle lit on] formal phrasal verb
to suddenly find something or think of something
Suddenly she lit upon a new way of approaching the problem.
Main entry: light
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light on
: having or using a small amount of (something)
a essay that is light on facts but heavy on speculation
She asked him to go light on the mustard. [=to not use a large amount of mustard]
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Main Entry: ↑light
Useful english dictionary. 2012.