Sentence:  But Moses hands were heavy; and they took a stone, and put it under him, and he sat thereon; and Aaron and Hur <WSD>stayed</WSD> up his hands, the one on the one side, and the other on the other side; and his hands were steady until the going down of the sun. 
Meaning of the word marked with <WSD> tags:  To prop; support; sustain; hold up; steady.