结舌 (結舌) jiéshé

jiéshé phrase tongue-tied; unable to speak
Domain: Modern Chinese 现代汉语 , Subdomain: , Concept:
Notes: Due to surprise or embarrassment (CC-CEDICT '結舌'; Guoyu '結舌'; Mathews 1931 '結舌', p. 106)

Also contained in

张口结舌 、 瞠目结舌 、 缄口结舌