A figure which strikes the hour on the bell of some fanciful clocks; Jack o' the clock. / (obsolete) A timeserver; an inconstant person.

plural of jail lock

A kind of cast-iron padlock. / Used other than figuratively or idiomatically: see jail, lock.

(computing, Java programming language) Initialism of Java archive.

A thick padded cover for a water heater used to keep heat in.

(dated) ajar

(archaic, medicine) Synonym of cupping glass

(slang) a mess jacket

A short woollen overcoat, originally as worn by sailors; a pea coat.

(fandom slang) The faction of Twilight fandom which prefers Bella Swan in a romantic relationship with Jacob Black.