A mechanical or (later also) electrical or electronic device for the measurement and indication of the passage of time; esp. any relatively large…

A clock. Scottish.

(a) ? A time-piece actuated by a spring. (b) ? A clock with a dial indicating minutes and seconds. Also watch pendulum clock.

A timepiece, esp. considered in regard to its capacity to keep good time. Now rare.

Chiefly with preceding adjective. A clock or watch, esp. one which keeps good or bad time; (also more generally) a machine or device which functions…

An imitation of the ticking of a clock or watch, or a similar sound; hence a child's name for a clock or watch.

figurative. Something likened to the face of a clock, watch, or sundial, in providing evidence or an indication of the passage of time. Now rare.

A clock or watch. colloquial (chiefly Children's colloquial). Cf. tick-tick, n.