Archaic second-person singular form of 'air,' meaning you air or expose something to air.
Old English 'ærest,' from Germanic roots meaning 'air.' The '-est' suffix marks the archaic second-person singular (like 'thou airest').
This is pure Shakespeare-speak—'thou airest thy grievances' would have sounded normal in 1600s English, but today it's vanished except in historical texts and King James Bible translations.
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