to make the usual sound of a duck(鸭子)呱呱叫,嘎嘎叫
disapproving a person who dishonestly pretends to have medical skills or knowledge冒牌医生,江湖医生,庸医
UK informal often disapproving a doctor医生
[ C ] the sound that a duck makes(鸭子)呱呱叫,嘎嘎叫
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