一反往常 yīfǎnwǎngcháng contrary to one's usual behavior Definitions Defs Origin Strokes Stroke Words Sentences Sents 一 yī adverbnumeral [suddenness] Used before a verb to indicate that an action or situation occurs suddenly or unexpectedly.反 fǎn noun opposite opposite; reverse; contrary; inside out or upside down往常 wǎngcháng nounadverb usual the usual state of things in the past; previous times