Verb
bat an eyelid (third-person singular simple present bats an eyelid, present participle batting an eyelid, simple past and past participle batted an eyelid)
(idiomatic, chiefly in the negative) To react in any slight way; to respond; to care.
Synonym: flinch
When laptop computers first came out they were something of a novelty. These days, nobody bats an eyelid.