To make something happen in Engpsh is to "make" it happen. This phrasal verb comes from the verb "make," which means to create or cause something to exist. Here are some examples of how you can use this phrasal verb in a sentence:
I will make sure the project is completed on time.
She made dinner for her family.
He made a mistake on the test.
In these examples, the speaker is using the phrasal verb "make" to talk about creating or causing something to happen.