[miàn zhé tíng zhēng]   

面    折    廷    争    面折：当面指责别人的过失；廷争：在朝廷上争论。指直言敢谏。 褒义>

指 面折：当面指责别人的过失；廷争：在朝廷上争论

Said of a loyal counsellor who gives admonition to the emperor in person

面谀背毁    面如灰土    面红耳热    面朋口友    面如傅粉