A banner or pennant of black cloth displayed as a warning of death, deadly intention, anarchy, etc.; spec. a sign that no quarter will be given or…

A flag of yellow material displayed as a signal; esp. a flag of yellow material, or (in later use) one patterned with squares of yellow and black…

A sign of danger, a warning; a signal to stop. Also figurative.

A yellow flag flown by a ship as a signal of quarantine. Cf. yellow flag, n.2 1.

Nautical. A blue flag with a white square in the centre, hoisted to signal that the vessel is about to sail. Also used as part of the international…

†(a) poetic a celestial or auroral flame (obsolete); (b) a flag giving warning of fire.

Nautical. A signal, esp. a flag, used to call back a boat to a ship, or a vessel to a squadron.

a white-bordered Union Jack formerly flown to request a pilot, and now used as a jack for civil shipping; cf. pilot flag n.

= paying-off pennant n. at paying off, n. compounds.

the red flag carried by a powder-hoy, or hoisted on a ship when taking in, carrying, or discharging gunpowder or explosives.

an extremely long pennant, often with a float at its tip, flown in place of the commissioning pennant by a ship returning to its home port to…

Nautical. A blue flag with a white square in the centre, hoisted as the signal of immediate sailing; = Blue Peter, n. 2a. rare.

(a) U.S. each of the flags used in the U.S. system of storm-signalling (Cent. Dict.); (b) the smallest national flag used at posts and flown only…

a flag used to indicate a negative response.

U.S. Surfing. A flag featuring a solid black disc on a yellow background, used to indicate that board surfing is prohibited or restricted in the…