idiom > Black as palm
Contents
烂如指掌
Pinyin: làn rú zhǐ zhǎng

Explanation: 犹言了如指掌。形容对情况了解得非常清楚。

No. 2
  Still made well aware of. Described the situation to understand very clearly. Qing Liu Xianting "Guang Yang miscellanies" Volume: "his father into the Bi, also different person, less for the Qundao, perhaps a reading knowledge of nothing, is the ancient and modern, chaos generation, non-success, bad as his hand."
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No. 3
  烂如指掌 (làn rú zhǐ zhǎng)
  解释:犹言了如指掌。形容对情况了解得非常清楚。
  出处:清·刘献廷《广阳杂记》卷三:“其父成璧,亦异人,少为群盗,未尝读书识之无,乃古今之世代治乱,是非成败,烂如指掌。”
  用法:作谓语;指对事物十分了解
  近义词:了如指掌、烂若披掌