stop dead in your tracks
/ˌstɒp ˌded ɪn jə ˈtræks/idiom
to suddenly stop moving because you are surprised or frightened
замереть на месте, остановиться как вкопанный
Русский аналог: «остановиться как вкопанный»
Есть и переходный вариант — stop someone in their tracks: The noise stopped me in my tracks.
“She stopped dead in her tracks when she saw the bear.”
“The news stopped me dead in my tracks.”
“He stopped dead in his tracks and turned around.”