If you say that something ticks you off, you mean that it annoys you. I just think it's rude and it's ticking me off She's still ticked off at him for brushing her off and going out with you instead
If you tick someone off, you speak angrily to them because they have done something wrong. His mum ticked him off at home Abdel felt free to tick him off for smoking too much Traffic police ticked off a pensioner for jumping a red light. see also ticking off = tell off
If you tick off items on a list, you write a tick or other mark next to them, in order to show that they have been dealt with. He ticked off my name on a piece of paper Tick it off in the box
{f} indicate that something has been done or completed by putting a check mark or a tick next to it (e.g.: "I made a list of the things you have to do, please tick off each one when you complete it"); (Slang) irritate a person; make a person angry; upset someone (e.g.: "It ticks me off when a child talks back impolitely to an older person")