威震天下

to inspire awe throughout the empire (idiom)

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action

day / sky / heaven

power / might / prestige

land under heaven / the whole world / the whole of China / realm / rule

to shake / to vibrate / to jolt / to quake / excited / shocked / one of the Eight Trigrams 八卦[ba1 gua4], symbolizing thunder / ☳

to inspire awe