To pick on someone

To pick on someone 

Meaning

To criticize or punish someone.

Examples

1. How to stop people from picking on you?

2. Sarah, please stop picking on Mark.

http://www.macmillandictionary.com/dictionary/british/pick-on

http://dictionary.cambridge.org/dictionary/english/pick-on-sb?q=pick+on

http://dictionary.cambridge.org/zht/詞典/英語/pick-on-someone-your-own-size

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