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1. To let out a wild, uncontrolled burst of anger or frustration. Wow, I've never seen Dave let rip into anyone like that. He's usually so mild mannered. I was expecting Mom to really let rip after she found out we'd broken the window, but she just sent us to our room for the last hour.
2. To far, especially noisily and indiscreetly. I can't believe you let rip in front of my parents like that. I was absolutely mortified.
1. If you let rip, you stop controlling yourself and suddenly do something with great energy or emotion. She throws her head back and lets rip with the loudest scream imaginable. Note: You can also say that someone lets it rip with the same meaning. Halfway through the song she lets it rip and you really feel the power of that voice. All of them know exactly when to let it rip and when to tread softly.
2. If you let rip, you suddenly express strong opinions and feelings about a subject that you previously didn't allow yourself to talk about. Every now and then in a relationship it's good to just let rip and say exactly how you feel. When he quit the Commons he let rip, claiming Parliament was `a club for fat, tired, unfit old men'.