A person or thing that is a constant source of deep hatred, resentment, or annoyance; an intensely detested individual.
那个总是喜欢背后说人坏话的同事，成了办公室里大家的心头刺，眼中疔。
That colleague who always gossips behind people's backs has become a thorn in everyone's heart and a boil in their eye in the office.
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