醍醐灌頂 [－－－顶]

Jyutping tai4 wu4 gun3 deng2
Pinyin tí hú guàn dǐng

Definitions (CC-CEDICT)
  1. lit. to anoint your head with the purest cream (idiom); fig. to enlighten people with perfect wisdom
  2. flawless Buddhist teaching
Definitions (粵典–words.hk)
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Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    to inspire someone with insightful words
  2. phrase, idiomatic
    to enlighten someone with wisdom for achieving nirvana