投诉
toú sù · HSK 4
complaint
📣 投 throw + 诉 tell = throw your grievance out, tell the manager
投 means to throw or cast (as in 投票 cast a vote), and 诉 means to tell or appeal (as in 告诉 tell). Together: cast your complaint at someone in authority — the customer-service sense of lodging a formal gripe.
投 — hand radical 扌 + weapon 殳
Originally a pictograph of a hand (扌) throwing or hurling a weapon or staff (殳). The core meaning 'to throw, cast, hurl' extended over time to figurative senses like 'to invest,' 'to deliver,' or 'to throw oneself into' something.