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general::
Phrase(s): light (up)on someone or something
1. Lit. to land on someone or something; to settle on someone or something. (Upon is formal and less commonly used than on.) • Three butterf lies lit on the baby, causing her to shriek with delight. • The bees lit on the clover blossom and pulled it to the ground. • Her glance lit upon a dress in the store window. 2. Fig. to arrive at something by chance; to happen upon something. • The committee lit upon a solution that pleased almost everyone. • We just happened to light upon this idea as we were talking to each other.
McGrawhill's American Idioms And Phrasal Verbs