Definition
This 4-character idiom means 'to know something as clearly as you know your own palm' — thoroughly familiar with a subject, place, or person. It functions as a predicate or adverbial phrase and is often used with 对 (toward) or 对…了如指掌. The tone is positive and emphatic; it implies deep, firsthand understanding, not just book knowledge.
f.e.
to know something like the back of one's handto be thoroughly familiar with
Examples
- 了如指掌。Tā duì zhè zuò chéngshì de lìshǐ liǎo rú zhǐ zhǎng.He knows the history of this city like the back of his hand.
- ，了如指掌。Wǒ suīrán méi qùguò nàlǐ, dàn duì dāngdì de fēngsú yě liǎo rú zhǐ zhǎng.Even though I've never been there, I'm thoroughly familiar with the local customs.
- ，了如指掌。Tā zài gōngsī gàn le èrshí nián, duì gōngsī yèwù liǎo rú zhǐ zhǎng.He has worked at the company for 20 years and knows its business like the palm of his hand.
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