quack

• 形容一个人谎称自己具有医疗技能或知识；也用来形容欺诈或伪造的事物。

Describes a person who falsely claims to have medical skill or knowledge; also used to describe something fraudulent or fake.

1. Medically unqualifiedB2informalmedical

   Relating to a person who falsely claims to have medical skills or knowledge, or to treatments that are not scientifically proven.

   江湖医生的

   • He was arrested for selling quack remedies that had no active ingredients.
   • She warned her friend against visiting a quack doctor who promised a miracle cure.
   • The internet is full of quack treatments for serious diseases.

   同义词boguscharlatanfakefraudulentpseudopseudoscientificshamunlicensed

   反义词certifiedlegitimatelicensedprofessionalqualified

• 名词，有两个不同含义：可指谎称自己具有医学技能或知识的人，也可指鸭子发出的独特而响亮的叫声。

A noun with two distinct meanings: it can refer to a person who falsely claims to have medical skill or knowledge, or to the characteristic harsh sound made by a duck.

1. Fake doctorB2informalmedical

   An untrained person who pretends to be a physician and dispenses medical advice.

   江湖医生

   • He went to a quack who sold him useless pills.
   • The authorities shut down the clinic run by a notorious quack.
   • She realized too late that the doctor was a quack.

   同义词charlatanfraudimpostormountebanksham

2. Duck soundA1formal

   The harsh, characteristic sound made by a duck.

   鸭叫声

   • The duck let out a loud quack as it swam across the pond.
   • We could hear the quack of ducks from the nearby lake.
   • The children laughed at the funny quack of the duck.

• 指鸭子发出的典型叫声，也用于比喻愚蠢、自命不凡或招摇撞骗的行为，尤指医学领域的江湖医术。

A verb used to describe the characteristic sound made by a duck, or to speak or act in a foolish, pretentious, or fraudulent manner, especially in relation to medicine.

1. Make a duck soundA1informal

   To make the characteristic harsh, throaty sound of a duck.

   嘎嘎叫

   • The ducks quacked loudly by the pond.
   • He quacked like a duck to make the children laugh.
   • We could hear the ducks quacking from across the field.

2. Act as a charlatanB2informal

   To pretend to have medical knowledge or skills, often by promoting fake remedies or treatments.

   冒充医生

   • He was arrested for quacking and selling fake cures.
   • She quacked her way into the health industry with false promises.
   • The man was known for quacking about miracle elixirs.