Apedia

Bat Variant Eye Eyelid Show Emotional Reaction Informal

Word not bat an eye = not bat an eyelid
Description show no emotional or other reaction - informal

Bat in this sense is perhaps a dialect and US variant of the verb bate meaning lower or let down. The variant not blink an eye is also found.

1997 - James Ryan - Dismantling Mr. Doyle – She did not bat an eyelid when Eve spelled out the unorthodox details of the accommodation they required. show no emotional or other reaction - informal

Bat in this sense is perhaps a dialect and US variant of the verb bate meaning lower or let down. The variant not blink an eye is also found.

1997 - James Ryan - Dismantlin

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