Usage Note
Pestañear means to blink the eyes, and the derived noun is pestañeo. A very common idiom is sin pestañear ('without blinking'), used figuratively to mean 'without hesitation or flinching' — lo aceptó sin pestañear. It is a regular -ar verb with no stem changes.
Examples
"Estaba tan asustado que no podía pestañear."
Natural Translation
He was so scared he couldn't blink.

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