Obsolete or dialectal form meaning to talk excessively or speak at length without purpose.
Middle English 'for-' (prefix) combined with 'gab' (to talk idly), with origins unclear but related to Germanic words for chatter and idle speech.
The prefix 'for-' when added to verbs often makes them excessive or thorough—'forgab' shows how medieval English could make 'gab' sound even more excessive and annoying!
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