entries → 投訴
TSUMUGU · TOCFL 4 (est.) · 詞
投訴 word · TOCFL 4 (est.)
投訴 ＝ 投 ＋ 訴
ㄊㄡˊ ㄙㄨˋ · tóusù
verb — to lodge a complaint; noun — a formal complaint

字源 FORM — what the parts do

投to throw; to submit (投資的投)tóu
訴to tell; to appeal (告訴的訴)sù
投訴，投資的投，告訴的訴。

故事 STORY — a scene to remember it by

把不滿丟（投）出去，講（訴）給管事的聽。
You throw your grievance out (投) and tell it (訴) to whoever is in charge.
記憶法
關 · Related
告訴gàosùto tell — the same 訴抱怨bàoyuànto grumble — the everyday version