gay as a skylark en · ADJ
Meanings
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(obsolete) Synonym of happy as a lark.
"An' I don't know, Thady, whether it was the fineness o' the day, or the thoughts o' the good dinner we wor to have, or the kindness o' the misthress, that med my heart so light, but I filt, anyhow, as gay as any skylark.
1850, Thomas Keightley, The Fairy Mythology, London: H.G. Bohn, page 515: