front; fore, forepart; foreground; face, disk, disc, frontage; facade, proscenium, facia, frontispiece; anteriority; obverse [of a medal or coin]., fore rank, front rank; van, vanguard; advanced guard; outpost; first line; scout., brow, forehead, visage, physiognomy, phiz, countenance, mug; rostrum, beak, bow, stem, prow, prore, jib., pioneer (precursor); metoposcopy.

be in front, stand in front; front, face, confront; bend forwards; come to the front, come to the fore.

fore, anterior, front, frontal.

before; in front, in the van, in advance; ahead, right ahead; forehead, foremost; in the foreground, in the lee of; before one's face, before one's eyes; face to face, vis-a-vis; front a front.

warning, early warning, caution, caveat; notice (information); premonition, premonishment; prediction; contraindication, lesson, dehortation; admonition, monition; alarm., 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 (indication of locality)., 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.

warn, caution; forewarn, prewarn; admonish, premonish; give notice, give warning, dehort; menace (threaten); put on one's guard; sound the alarm; croak., beware, ware; take warning, take heed at one's peril; keep watch and ward (care).

warning; premonitory, monitory, cautionary; admonitory, admonitive; sematic., warned, forewarned; on one's guard (careful) [more], (cautious) [more].

in terrorem (threat).