Sentence:  And it came to pass, when Moses held up his hand, that Israel <WSD>prevailed</WSD>; and when he let down his hand, Amalek <WSD>prevailed</WSD>. 
Meaning of the word marked with <WSD> tags:  To be superior in strength, dominance, influence or frequency; to have or gain the advantage over others; to have the upper hand; to outnumber others.