Verb + 掉
吃掉 (chīdiào) means "to eat up" or "to eat completely," using the resultative complement 掉 to indicate that the action of eating results in something being entirely consumed or removed. This pattern of verb + 掉 is productive in Chinese and conveys completion or removal. Other examples include 扔掉 (throw away) and 忘掉 (forget completely).
弟弟把一整块蛋糕都吃掉了。
Dìdi bǎ yī zhěng kuài dàngāo dōu chī diào le.
My younger brother ate an entire cake.
桌上的水果被孩子们吃掉了。
Zhuō shàng de shuǐguǒ bèi háizimen chī diào le.
The fruit on the table was eaten up by the children.
快把剩饭吃掉,别浪费。
Kuài bǎ shèngfàn chī diào, bié làngfèi.
Hurry and eat up the leftovers — don't waste them.