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Jyutping fu2 si1 ming4 soeng2
Pinyin kǔ sī míng xiǎng

Definitions (CC-CEDICT)
  1. to consider from all angles (idiom); to think hard
  2. to rack one's brains
Definitions (Wiktionary)
  1. phrase, idiomatic
    to think long and hard
Examples (Wiktionary)
  1. Mandarin
    苦思冥想
    苦思冥想
    kǔ sī míng xiǎng
    • to think long and hard