Wordnet 3.0
VERB (1)
1. 
 find unexpectedly; 
- Example: "the archeologists chanced upon an old tomb"- Example: "she struck a goldmine"- Example: "The hikers finally struck the main path to the lake"[syn: fall upon, strike, come upon, light upon, chance upon, come across, chance on, happen upon, attain, discover]
WordNet (r) 3.0 (2006):
chance on
    v 1: find unexpectedly; "the archeologists chanced upon an old
         tomb"; "she struck a goldmine"; "The hikers finally struck
         the main path to the lake" [syn: fall upon, strike,
         come upon, light upon, chance upon, come across,
         chance on, happen upon, attain, discover]