crack up

Compare Japanese 笑う (warau, “laugh, smile”), suffixed from Japanese 割る (waru, “crack”).

• "It was hilarious. We were cracking up the whole time."
• "The joke about the nuns in the bath cracked me up."
• "The joy of “Ticket to Paradise” comes not from its predictable plotting or razor-thin screenplay; it’s from watching them together, from observing how the sparks still fly, and (when the former flames get drunk and let their guards down, or during the end-credit outtakes) watching them crack each other up."
• "She got through the war, but cracked up when her sister died."
• "All rather inhuman and undernourished, isn’t it? Well, that, children, is the true sign of cracking up."
• "The university was really cracking up, losing faculty, students and donors, and it seemed like to go under."
• "My motorcycle cracked up before I arrived."
• "I have to crack up that little clique."