Now that he's passed his exams and got his qualifications he's decided to let his hair down. (*) behave informally (*) behave noisily (*) behave easily (*) behave fully
This is a companion discussion topic for the original entry at https://english.best/questions/23405,now-that-hes-passed-his-exams-and-got-his-qualifications-hes-decided-to-ulet-his-hair-downu/