失态 shītài to forget one's manners
to forget one's manners; to forget oneself; to lose self-control (in a situation)
How to remember 失态: 失 to lose + 态 attitude = to forget one's manners.
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How it is used
- To lose one's composure / behave improperly - 当众失态 (dāngzhòng shītài) lose one's dignity in public; 酒后失态 (jiǔhòu shītài) misbehave when drunk.
- About slipping from proper conduct, embarrassing oneself. Written-leaning.