figure out
Separable
Understand or solve something after thinking about it
I cannot figure out how this app works.
Usage
More common in American English; British speakers more often say 'work out'.
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.
The particle: out
This verb belongs to the group ‘finding an answer’.
Practise it
Add it to your daily practice or see every verb with out.
Further reading: figure out on Wiktionary (CC BY-SA).