keep guard

Từ điển WordNet v3.1 - WordNet Dictionary

verb

watch over so as to protect (Freq. 1)
- We must stand sentinel to protect ourselves
- The jewels over which they kept guard were stolen
• Syn:
stand guard, stand watch, stand sentinel
• Hypernyms:
guard
• Verb Frames:
- Somebody ----s
- Somebody ----s PP