"The learned man hath got the Lady gay."
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Shakespeare et al., The Passionate Pilgrime, 1599. "Gay" here means "fine, beautiful, noble, excellent".
"The concord of brethren and agreeing of brethren is a gay thing."
-- H. Latimer, "Most Faithful Sermon before King's Majesty", 1550. Oxford English Dictionary. "Gay" here means "good".
"If an Amish young man enters the outside world—what they call ‘going gay’—his father is relieved of the obligation of providing a farm for that son."
-- Washington Post, 9 Nov., 1969. Oxford English Dictionary. "Gay" here describes "a person who has ceased adhering to the plain and simple life or beliefs of the community", usually Amish, Quaker, or some other fairly strict religious community.