From Longman Dictionary of Contemporary Englishwithout missing a beatwithout missing a beatCALMif you do something without missing a beat, you do it without showing that you are surprised or shocked She handled all of their questions without missing a beat. → miss
Examples from the Corpus
without missing a beat• Cuomo answered the reporters' questions without missing a beat.• They can present, explain, and deliver our solutions without missing a beat.• Woody Harrelson came in for the late Nicholas Colasanto without missing a beat. 