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Jyutping ji5 leon2 tau4 sek6
Pinyin yǐ luǎn tóu shí

Definitions (Wiktionary)
  1. phrase, idiomatic
    Synonym of 以卵擊石/以卵击石 (yǐluǎnjíshí, “to overestimate one's capabilities or to attack a stronger opponent as the weaker side which is sure to end in failure”).
    (syn.) 螳臂当车, 螳臂當車, 以卵击石, 以卵擊石