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tick

noun [C] (MARK)
 
 
/tɪk/ mainly UK (US usually check)

Definition

A2 a mark (✓) that shows that something is correct or has been done: Put a tick by/against the names of the people who have accepted the invitation.Specific signs and symbolsSigns, signals and symbols
(Definition of tick noun (MARK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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