当口 dāngkou critical moment Origin Definitions Defs Strokes Stroke Words Sentences Sents 当 當 dāng prepositionadverb at a time At a given time or place; just as; while; when (often used in the pattern 当...的时候 dāng... deshíhou)口 kǒu noun gateway entrance, exit, or pass, such as a mountain pass, port, or gate in the Great Wall