bat an eye

Translations
и глазом не моргнуть
He didn't bat an eye when he heard the shocking news.
Он и глазом не моргнул, когда услышал шокирующую новость.
Definitions
To show a visible reaction, usually surprise or shock, often used in the negative form (not bat an eye) to mean not showing any reaction at all.
Words
bat

verb
моргнуть
an

article or possessive pronoun
один
eye

noun
глаз