"keep back"

1. If you keep something back, you don't tell someone about it.

    Synonym: withhold (formal)

keep back sth 

The police suspected that he was keeping back some important information.

keep sth back 

I could tell that she was keeping something back from me.

1. If something keeps you back, it stops you from getting where you want to go.

    Synonym: hold back, hinder, hamper

keep sb back 

She's a talented musician, but her health problems are keeping her back.

The country wants to develop, but their poor education system will keep them back.