noun

• (countable) Something which causes grief.
• (countable) A wrong or hardship suffered, which is the grounds of a complaint.
• (uncountable) Feelings of being wronged; outrage.
• (countable) A complaint or annoyance.
• (countable) A formal complaint, especially in the context of a unionized workplace.
• (uncountable) Violation of regulations or objectionable behavior.