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Jyutping ming5 si1 fu2 sok3
Pinyin míng sī kǔ suǒ

Definitions (CC-CEDICT)
  1. to mull over (idiom)
  2. to think long and hard
Definitions (Wiktionary)
  1. phrase, idiomatic
    to think long and hard; to rack one's brains; to cudgel one's brains
    (syn.) 冥思苦想
    • 只有蠢人,才是他一個人,或者邀集一堆人,不作調查,而只是冥思苦索地“想辦法”,“打主意”。
      只有蠢人,才是他一个人,或者邀集一堆人,不作调查,而只是冥思苦索地“想办法”,“打主意”。
      zhǐ yǒu chǔn rén , cái shì tā yī gè rén , huò zhě yāo jí yī duī rén , bù zuò diào chá , ér zhǐ shì míng sī kǔ suǒ de “ xiǎng bàn fǎ ” , “ dǎ zhǔ yì ” .
      Only a blockhead cudgels his brains on his own, or together with a group, to "find solution" or "evolve an idea" without making any investigation.
Examples (Wiktionary)
  1. Mandarin
    只有蠢人,才是他一个人,或者邀集一堆人,不作调查,而只是冥思苦索地“想办法”,“打主意”。
    只有蠢人,才是他一個人,或者邀集一堆人,不作調查,而只是冥思苦索地“想辦法”,“打主意”。
    zhǐ yǒu chǔn rén , cái shì tā yī gè rén , huò zhě yāo jí yī duī rén , bù zuò diào chá , ér zhǐ shì míng sī kǔ suǒ de “ xiǎng bàn fǎ ” , “ dǎ zhǔ yì ” .
    • Only a blockhead cudgels his brains on his own, or together with a group, to "find solution" or "evolve an idea" without making any investigation.