Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

(information) 527; premonition, premonishment†; prediction &c 511; contraindication, lesson, dehortation†; admonition, monition; alarm &c 669. handwriting on the wall, mene mene tekel upharsin, red flag, yellow flag; fog-signal, foghorn; siren; monitor, warning voice, Cassandra†, signs of the times, Mother Cary's chickens†, stormy petrel, bird of ill omen, gathering clouds, clouds in the horizon, death watch. watchtower, beacon, signal post; lighthouse &c (indication of locality) 550. sentinel, sentry,, watch, watchman; watch and ward; watchdog, bandog†, housedog†; patrol, patrolman, vedette†, picket, bivouac, scout, spy, spial†; undercover agent, mole, plainclothesman; advanced guard, rear guard; lookout. cautiousness &c 864. monitor, guard camera, radar, AWACS, spy satellite, spy-in-the- sky, U2 plane, spy plane. V. warn, caution; forewarn, prewarn†; admonish, premonish†; give notice, give warning, dehort†; menace &c (threaten) 909; put on one's guard; sound the alarm &c 669; croak. beware, ware; take warning, take heed at one's peril; keep watch and ward &c (care) 459. Adj. warning &c v.; premonitory, monitory, cautionary; admonitory, admonitive†; sematic [Biol.]. warned, forewarned &c v.; on one's guard &c (careful) 459, (cautious) 864. Adv. in terrorem [Lat.] &c (threat) 909. Int. beware!, ware!, take care!, look out!, fore (golf), mind what you are about!, take care what you are about!, mind!, Phr. ne reveillez pas le chat qui dort [Fr.], don't wake a sleeping cat; foenum habet in cornu [Lat.]; caveat actor; le silence du people est la legon des rois [Fr.]; verbum sat sapienti [Lat.], a word to the wise is sufficient; un averti en vaut deux [Fr.].