In English, "口袋" is translated as "pocket". This word comes from the Old English "pocca", which means "bag" or "pouch". Here are some example sentences in English and their translations in Chinese:

She kept her phone in her pocket. 她把手机放在了口袋里。

He put his hands in his pockets and looked around. 他把手放进口袋里，四处张望。

The jacket has two pockets on the front. 这件夹克有两个前袋。

In general, "pocket" refers to a small bag or pouch, usually sewn into or attached to clothing, that is used to carry small items such as keys, coins, or tissues. It is commonly used to refer to the small compartments or pockets in clothing where these items can be stored.