on duty's Usage Examples:

patrolmen under the leadership of Captain Snerdley; the four of them always goofed up while on duty, and spent most of their time in disco clubs.

on duty during the day, and three overnight, supported by a paramedic duty officer.

his cell after the deputy on duty handed over the keys to the cell at gunpoint.

The commandos in the power station discovered that the Germans had left the control room and only a Norwegian engineer was on duty.

Sikh busmen in Wolverhampton win the right to wear their turbans whilst on duty.

Roosevelt of the United States of America ordered a national mobilization in the Philippines and on August 23, 1942, the first group of reservist in Negros were called on duty by virtue of Philippine Army HQ order of August 4 and they were trained here.

HistoryThe Spanish–American War was the first widespread award of campaign medals, both for service in the actual conflict and for participation in subsequent garrison and occupation duty.

Rescue attempts, medical operationThe tower cab coordinator on duty at the time of the accident stated that he saw a fireball emanating from the crash site following the accident.

A night porter is a porter who is on duty during the night.

Their star driver is Mother Tucker (Bill Cosby), a talented antihero who drinks alcohol on duty, harasses nuns, and behaves brazenly towards practically everybody he meets, including his partner Leroy (Bruce Davison).

Military Police of both sides provide security for the JSA with guard forces of no more than 35 security personnel on duty at any given time.

In the close season, Dawson contracted glandular fever whilst on duty with the England under-21s, causing him to miss the start of the 2003–04 season.

Reid shot the first British Army soldier on duty killed in the Troubles and was later himself killed as he attempted another.

Synonyms:

on-the-spot, on-the-scene,

Antonyms:

off-site,