A lunchbox is a box you put food in and carry to school or work. In British English you will also see lunch box as two words; it is the same thing.

A lunchbox is a box you put food in and carry to school or workLunchbox是一個裝食物、帶去上學或上班用的盒子。In British English you will also see lunch box as two words在英式英文裡你也會看到lunch box分兩個字寫; it is the same thing意思是一樣的。

Children use it more than adults, though office workers carry them too. The food inside is the lunch; the box is just the container — plastic, metal, or a bag that still gets called a lunchbox.

Children use it more than adults小孩用這個字比大人多, though office workers carry them too不過上班族也會帶。The food inside is the lunch裡面的食物才是lunch; the box is just the container盒子只是容器 — plastic, metal, or a bag that still gets called a lunchbox可能是塑膠、金屬，或一個袋子，但還是會被叫做lunchbox。

Though actually, in some places, especially Britain and Australia, older speakers sometimes use lunchbox as a rude joke about a man's body. That is slang, not the school meaning, and you do not need it; I mention it only so a laugh in class does not puzzle you.

Though actually不過, in some places, especially Britain and Australia在某些地方，尤其是英國和澳洲, older speakers sometimes use lunchbox as a rude joke about a man's body年紀較大的人有時會用lunchbox來開男性身體部位的粗俗玩笑。That is slang, not the school meaning這是俚語，不是校園裡那個意思, and you do not need it你不需要學這個用法; I mention it only so a laugh in class does not puzzle you我提它只是為了讓你在課堂上聽到笑聲時不會一頭霧水。

The word is informal and homely. A very grand restaurant will not ask if you brought your lunchbox.

The word is informal and homely這個字很口語、也很家常。A very grand restaurant will not ask if you brought your lunchbox再高級的餐廳也不會問你有沒有帶lunchbox。