Verb light upon has 1 sense
  1. fall upon, strike, come upon, light upon, chance upon, come across, chance on, happen upon, attain, discover - find unexpectedly; "the archeologists chanced upon an old tomb"; "she struck a goldmine"; "The hikers finally struck the main path to the lake"
    --1 is one way to find, regain
    Sample sentence:
    Somebody ----s something
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