Definition
to cause someone to laugh heartily, or to laugh heartily oneself
（让某人）笑得不行
His pranks always crease everyone up.
他的恶作剧总是让大家笑得不行。
Her joke really creased me up; I nearly fell off my chair.
她的笑话真的让我笑得不行；我差点从椅子上摔下来。
No matter how serious he is, his way of speaking always creases us up.
不管他有多严肃，他的说话方式总是让我们笑得不行。