捧圣旨

Traditional (Taiwan): 捧聖旨

pěngshèngzhǐ ㄆㄥˇ ㄕㄥˋ ㄓˇ

    • to act as if with unquestionable backing from higher authority

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
to hold an imperial edict
Meaning
To have received instructions from higher authority, and so act as if with unquestionable backing. Often ironic.

Sources