A dialectal or informal way of saying 'a bit,' meaning somewhat or a small amount.
Contraction of 'a' + 'bit,' where 'bit' comes from Old English 'bite' (a piece or morsel); the 'a' gets absorbed into the next word in casual speech.
This spelling shows how real people talk—English speakers have been casually combining 'a bit' into 'abit' for centuries, and it reveals how written language chases after spoken language.
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