From Wiktionary, the free dictionary
ngã ngửa
- to get extremely surprised, due to the unexpected.
- Synonym: té ngửa
- Near-synonym: hớp hồn
Cả giáo xứ ngã ngửa trước tin vị linh mục ấy vừa qua đời.- The entire fellow was astonished by the announcement of the priest's very death.
- Not to confuse with the verbal phrase, ngã ngựa.