流于形式 liú yú xíng shì

DEFINITIONS

  1. to become a mere formality

CHARACTERS

流 liú
HSK 4
flow, circulate, drift; class
于 yú
HSK 3
in, on, at; go to; surname
形 xíng
HSK 5
form, shape, appearance
式 shì
HSK 4
style, system, formula, rule