(medicine, countable) Initialism of rapid antigen test. / (aviation, countable) Initialism of ram air turbine. / (computing, countable) Initialism of remote-access Trojan.

(regional) To scratch or score. / (regional, rare, obsolete) To tear, rip, rend. / Damn, drat, blast; used in oaths.

(regional) A scratch or a score. / (nautical, regional) A place in the sea with rapid currents and crags where a ship is likely to be torn apart in stormy weather.

(usually with “on” or “out”) To betray a person or party, especially by telling their secret to an authority or an enemy; to turn someone in.

(military, slang) A ration.

(zoology) A medium-sized rodent belonging to the genus Rattus.

The first of the 12-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar.

(transitive) To tattle, squeal about (someone)

(chiefly informal) Short for muskrat.

Third-person singular simple present indicative form of rat