Definition of David and Goliath adjective from the Oxford Advanced Learner's Dictionary

 

David and Goliath

 adjective
adjective
BrE BrE//ˌdeɪvɪd ənd ɡəˈlaɪəθ//
 
; NAmE NAmE//ˌdeɪvɪd ənd ɡəˈlaɪəθ//
 
 
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used to describe a situation in which a small or weak person or organization tries to defeat another much larger or stronger opponent The match looks like being a David and Goliath contest. From the Bible story in which Goliath, a giant, is killed by the boy David with a stone.
See the Oxford Advanced American Dictionary entry: David and Goliath