OED Definition: (Noun) The apparent arch or vault of heaven overhead; the sky, the firmament.

Richard III: ‘Amaze the welkin with your broken staves’ (Richard III V.ii.3858)
Lord: ‘Thy hounds shall make the welkin answer them.’ (The Taming of the Shrew Prologue 2.189)
Sir Toby Belch: ‘But we shall make the welkin dance indeed?’ (Twelfth Night II.iii.758)

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