Longman Dictionary of Contemporary English homepage

Sense: 1,3-5
Date: 1200-1300
Origin: Origin unknown.
Sense: 2
Origin: Old English ticia

tick

1 noun
     
Related topics: Insects, Education
tick1
1 [countable]SE British English a mark written next to an answer, something on a list etc, to show that it is correct or has been dealt with [= check American English]
Put a tick in the box if you agree with this statement.
cross2 (2b)
2 [countable]HBI a very small animal like an insect that lives under the skin of other animals and sucks their blood
3 [singular] the short repeated sound that a clock or watch makes every second
4 [countable] spoken especially British English a very short time [= moment]:
I'll be with you in a tick (=soon).
It'll only take two ticks.
5

on tick

British English informal old-fashioned if you buy something on tick, you arrange to take it now and pay later [= credit]

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