to take advantage of sb in an unguarded moment (idiom); to take sb by surprise
trad. 乘人不備
Also written 乘人不備【chéng rén bù bèi】
to take advantage of sb in an unguarded moment (idiom); to take sb by surprise
trad. 乘人不備
Also written 乘人不備【chéng rén bù bèi】