投诉 tóusù to lodge a complaint
How to remember 投诉: 投 to pitch + 诉 tell = to lodge a complaint.
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How it is used
- To lodge a complaint (formally, as a customer/citizen): 向公司投诉 (xiàng gōngsī tóusù) to complain to the company, 投诉电话 (complaint hotline).
- Formal grievance channel - to a business, authority, or platform.
- Distinguish from 抱怨 (bàoyuàn, to complain/grumble informally); 投诉 is an official complaint seeking redress.