guard

verb1 of 2

to keep watch over something to protect it e.g., a bank

• “You must keep up your guard even after a victory.”Tatoeba
• “Their bags were checked by security guards at the gate.”Tatoeba

Sentences from Tatoeba show real usage. A word can have several meanings, so a sentence may use another one.

noun2 of 2

A person who, or thing that, protects or watches over something.