眼中钉，肉中刺 (眼中釘，肉中刺) yǎnzhōngdīng, ròuzhōngcì

yǎnzhōngdīng, ròuzhōngcì phrase a thorn in one's side
Domain: Modern Chinese 现代汉语
Notes: (CC-CEDICT '眼中釘，肉中刺')