Definition of tick

• n. - Credit; trust; as, to buy on, or upon, tick.
• v. i. - To go on trust, or credit.
• v. i. - To give tick; to trust.
• n. - Any one of numerous species of large parasitic mites which attach themselves to, and suck the blood of, cattle, dogs, and many other animals. When filled with blood they become ovate, much swollen, and usually livid red in color. Some of the species often attach themselves to the human body. The young are active and have at first but six legs.
• n. - Any one of several species of dipterous insects having a flattened and usually wingless body, as the bird ticks (see under Bird) and sheep tick (see under Sheep).
• n. - The cover, or case, of a bed, mattress, etc., which contains the straw, feathers, hair, or other filling.
• n. - Ticking. See Ticking, n.
• v. i. - To make a small or repeating noise by beating or otherwise, as a watch does; to beat.
• v. i. - To strike gently; to pat.
• n. - A quick, audible beat, as of a clock.
• n. - Any small mark intended to direct attention to something, or to serve as a check.
• n. - The whinchat; -- so called from its note.
• v. t. - To check off by means of a tick or any small mark; to score.