吃 + 午餐
The noun 午餐 (wǔcān) means "lunch" and is a slightly more formal term than 午饭. It refers to the midday meal and is commonly used in both spoken and written Chinese. For example, 一起吃午餐 means "to eat lunch together."
我们中午一起吃午餐吧。
wǒmen zhōngwǔ yìqǐ chī wǔcān ba.
Let's have lunch together at noon.
他每天都自己带午餐去公司。
tā měitiān dōu zìjǐ dài wǔcān qù gōngsī.
He brings his own lunch to the office every day.
今天的午餐是妈妈做的三明治。
jīntiān de wǔcān shì māma zuò de sānmíngzhì.
Today's lunch is a sandwich made by mom.