Definition of tick noun from the Oxford Advanced American Dictionary

     

    tick

     noun
    noun
    NAmE//tɪk//
     
     
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  1. 1[countable] a small insect that bites humans and animals and sucks their blood. There are several types of ticks, some of which can carry diseases a tick bite
  2. 2(also ticking) [uncountable] a short, light, regularly repeated sound, especially that of a clock or watch The only sound was the soft tick of the clock.
See the Oxford Advanced Learner's Dictionary entry: tick