on guard

adj — 3 senses

on guard

adj

1

Fencing, Government, Hobbies, Lifestyle, Martial arts, Military, Politics, Sports, War The starting position of a fencing bout.

We fall on guard, and after all it is a friend who comes to meet us.1881, Robert Louis Stevenson, Virginibus Puerisque:

2

Vigilant, alert.

3

Aeronautics, Aerospace, Aviation, Business, Engineering, Natural sciences, Physical sciences Transmitting on the aircraft emergency frequency.

Antonyms: off guard

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.