Definition of sentry in English:

sentry

Syllabification: sen·try
Pronunciation: /ˈsentrē
 
/

noun (plural sentries)

Phrases

stand sentry

Keep guard or control access to a place.
More example sentences
  • Because of security woes, classes began two weeks late this year, with armed guards standing sentry at school gates.
  • The number of security guards patrolling its eastern borders exceeds those standing sentry on the closely watched border between the US and Mexico.
  • Relaxed Chinese guards armed with automatic rifles were standing sentry at the 217-meter-long bridge.

Origin

early 17th century: perhaps from obsolete centrinel, variant of sentinel.

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