brush your hair
The phrase 'cepillarse el pelo' in Spanish stands for 'brush your hair' in English. It is a reflexive verb phrase, which are common in Spanish language. 'Cepillarse' comes from the verb 'cepillar' which means to brush, and 'el pelo' simply means the hair. So, when put together, this phrase gives an instruction to brush one's hair. In general, when instructions are given in Spanish, they are regularly given in the reflexive form.
Before going out, I have to brush my hair.
In this sentence, the phrase 'cepillarse el pelo' is used to convey the idea of personal grooming as part of preparations to go out.
I always have to remind my children to brush their hair before going to school.
In this sentence, the phrase 'cepillarse el pelo' is used to convey a routine activity that the speaker often has to remind their children about.
It's easier to brush your hair when it's wet.
In this sentence, the phrase 'cepillarse el pelo' is used in a context of giving a general advice about hair grooming.