A bird that bounces or bobs up and down, or a whimsical name for an unidentified or imaginary bird.
Combining 'dingle' (to swing or dangle) with 'bird,' this appears to be either an old dialectal term or a whimsical creation, possibly influenced by onomatopoeia and nonsense words common in regional British and American English.
The suffix '-bird' often attaches to invented creatures in English—think 'jailbird' and 'eggbird'—showing how we playfully name things we can't quite categorize or that seem silly.
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