call back

Separable

Return a phone call

I will call you back this afternoon.

Usage

British English also says 'ring back'.

Separable

The object can go between the verb and the particle: turn the light off, or turn off the light. When the object is a pronoun it must go in the middle: turn it off, never turn off it.

Practise it

Add it to your daily practice or see every verb with up.

Further reading: call back on Wiktionary (CC BY-SA).