haircut
The Spanish phrase 'cortarse el pelo' translates to 'haircut' in English. It is a compound verb phrase that literally means 'to cut one's hair'. In Spanish, reflexive verbs like 'cortarse' are used to express personal actions, so 'cortarse el pelo' refers to the action of cutting one's own hair, similar to how we use the term 'haircut' to refer to the act of having one's hair cut by another person.
I'm going to cut my hair tomorrow.
The phrase is in future tense indicating a planned action to occur the next day. The subject 'I' is the one performing the action of cutting the hair.
You should cut your hair.
The speaker is giving advice or making a suggestion to the person they are speaking to. The action of cutting the hair is something the speaker thinks the listener should do.
My brother decided to cut his hair short.
The speaker is communicating a past decision made by a third party (his/her brother). The action of cutting the hair short is described as a decided action.