n.

1. 抱怨；抗议；怨言；抱怨的缘由[C][U][（+about/over/against）]
   There is no real reason for complaint.

   没有什么可抱怨的理由。

2. 【律】控告；控诉[C][（+against/with）]
   The storekeeper signed a complaint accusing them of shoplifting.

   店主签署了控告书，指控他们在店里扒窃货物。

3. 疾病，身体不适[C]
   Arthritis is a common complaint among the elderly.

   关节炎是老年人的一种常见病。

n.

1. an act or the action of complaining.
   ▸a reason for dissatisfaction.
   ▸Law  the plaintiff's reasons for proceeding in a civil action.
2. an illness or medical condition, especially a minor one.