The Hebrew noun gay (also spelled gai) means a valley or ravine — a low place between hills or mountains. It is most famously used in Psalm 23:4 in the phrase 'valley of the shadow of death.'
The gay in Psalm 23 ('Even though I walk through the valley of the shadow of death') has become one of the most beloved and comforting phrases in all of Scripture. The valley represents the deep, dark, dangerous places of life — suffering, loss, fear, and death itself. Yet the Shepherd is present there. The prophet Isaiah uses similar valley imagery to speak of God preparing a highway through the wilderness (Isaiah 40:4), where every valley shall be lifted up. God transforms valleys of despair into highways of salvation.