对得起
duì de qǐ · HSK 7
not to let sb down
🤝 对 face + 得 able + 起 rise = able to face and rise to someone's trust
Breaking it down: 对 means facing toward, 得 marks ability, 起 means to rise up. Together they form the idea of being able to rise up and face someone — meaning you have treated them fairly and not let them down.
对 — 又 (hand) + 寸 (measure/rule)
Originally depicted a hand (又) holding or responding to something, with 寸 added as a phonetic-semantic element suggesting measured action. The traditional form 對 showed a hand presenting an object in reply, giving the core sense of 'to answer' or 'face toward.' Modern meanings like 'correct' and 'pair' grew from this idea of matching response.
得 — 彳 (step) + 旦 (sun/day) + 寸 (hand)
Originally depicted a hand 寸 reaching for a cowrie shell 貝 (later simplified to 旦), with 彳 'step' added to show going out and obtaining something. The core meaning is 'to get' or 'obtain'. The reading děi extends this to 'must/have to' — what one is obliged to get done.
起 — 走 (run) + 己 (self/phonetic)
起 combines 走 'run/walk' as the meaning component with 己 as the phonetic component. The 走 element suggests movement of the body, giving the core sense of rising up or starting to move. From there it extended to meanings like 'get up,' 'begin,' and 'arise.'