Bring/pull somebody up short - Idioms by The Free Dictionary
bring/pull somebody up short
pull someone up short
to cause someone to stop short. My scream pulled him up short. The sudden thought that everything might not be all right pulled Tom up short.
bring/pull somebody up ˈshort make somebody stop what they are doing because something attracts their attention or because they suddenly realize something: His criticism of my work pulled me up short, because I thought he was pleased with it.