Ik laat mijn haar knippen.
English: I have my hair cut.
Causative constructions with 'laten' in Dutch are used to express that someone causes someone else to do something, or lets something happen. It is similar to saying 'to have something done' or 'to let someone do something' in English.
You use 'laten' in Dutch when you want to say that you allow someone to do something, or you arrange for someone to do something for you. It is common when talking about services or permissions.
Ik laat mijn haar knippen.
English: I have my hair cut.
Zij laat haar kinderen buiten spelen.
English: She lets her children play outside.
We laten de auto repareren.
English: We have the car repaired.
Hij laat zijn hond uit.
English: He lets his dog out.