escort
n. countable B2 Upper Intermediate US //ˈɛskɔɹt// es·cort
n. a person or group that travels with someone to protect them or show them the way. You might have one for safety or because you are visiting a new place.
n. a person, vehicle, or group accompanying another for protection, guidance, or as a mark of honour.
The president traveled with a police escort.
Visitors to the high-security facility must remain with their official escort at all times while on the premises.
The naval fleet provided a heavy escort for the merchant vessels as they navigated the narrow strait, which was known for its unpredictable currents and pirate activity.
Borrowed from French escorte, itself borrowed from Italian scorta.
Usage
Often used with the preposition 'for' to indicate the person or thing being protected.