MOUNT / STAND / KEEP GUARD (OVER SB/STH)
Meaning of MOUNT / STAND / KEEP GUARD (OVER SB/STH) in English
to watch or protect sb/sth :
Four soldiers stood guard over the coffin.
Oxford Advanced Learner's English Dictionary.
Оксфордский английский словарь для изучающик язык на продвинутом уровне.
2005