About
汽 (qì) is a phono-semantic compound formed by the semantic water radical 氵 (shuǐ) and the phonetic component 气 (qì). It originally described water drying up or reaching a state of depletion. From this concrete meaning of nearing an end, it evolved into the abstract adverbial sense of "almost" or "nearly". This usage became prominent in classical Chinese literature to indicate proximity to a state or condition, though it is now rare in everyday modern speech.