Past tense or past participle of 'bagpipe'; to play bagpipes or to make bagpipe sounds.
From 'bagpipe' plus the regular past tense suffix '-ed,' treating the noun 'bagpipe' as a verb.
English verbs evolved from nouns constantly—'piano' became 'to piano,' 'bugle' became 'to bugle'—it's how language stays flexible when we need to describe actions associated with objects.
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