Scottish/archaic: the present participle of 'airth'; the act of directing, locating, or positioning something.
From 'airth' with the present participle suffix -ing, following English verb formation patterns. Primarily Scottish.
Adding '-ing' to 'airth' creates a gerund that sounds almost musical in Scots—'the airthing of the ship' would mean the positioning or navigation of the vessel, a form of language that's almost extinct today.
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