(tik) noun
1. A light recurring sound made by a watch, clock, or similar mechanism.
2. Brit. Colloq. The length of time occupied by one tick of a watch or clock: I'll be through in five ticks.
3. A mark, as a dot or dash, used in checking off something.
—v.i. To make or sound a tick or ticks; make a recurrent clicking sound, as a running watch or clock.
—v.t. Brit. To mark or check with ticks.
—to tick off Brit. Colloq. To tell off. [Prob. imit.]

(tik) noun
1. One of numerous flat, leathery, bloodsucking arachnids (order Acarida) that attack the skin of man and other animals; especially, the cattle tick (Margaropus annulatus), causative agent of Texas fever.
2. Any of certain two–winged or wingless parasitic insects (family Hippoboscidae), as the sheep ticks and bat ticks. [Cf. LG tieke, G zecke a tick]

(tik) noun
1. The stout outer covering of a mattress; also, the material for such covering.
2. Colloq. Ticking. [Earlier teke, tyke, ult. <L teca, theca <Gk. thēke a case]

(tik) noun Brit. Colloq.
Credit; trust: to buy something on tick. [Short for TICKET]