The character 吃 (chī) features the mouth radical 口 (kǒu) on the left, signaling a mouth-related action, combined with 乞 (qǐ, "to beg/seek") as the phonetic component. The combination historically suggested "seeking with the mouth," which evolved into the everyday meaning of eating. In earlier classical Chinese, 食 (shí) was the dominant verb for eating, but 吃 gradually overtook it in vernacular Mandarin from the Tang and Song dynasties onward.

Food is central to Chinese social life — greetings like 你吃了吗？(Nǐ chī le ma?, "Have you eaten?") function as casual "how are you?" equivalents, reflecting the cultural importance of sharing meals. Be aware that 吃 combines with many words to form common expressions: 吃饭 (chī fàn, "to eat a meal/rice"), 吃醋 (chī cù, "to feel jealous," literally "to eat vinegar"), and 吃苦 (chī kǔ, "to endure hardship," literally "to eat bitterness").