let it rip

let it rip  {v. phr.},  {used imperatively},  {slang}
1. Don't be concerned; pay no attention to what happens.
Why get involved? Forget about it and let it rip.
2. (Imperatively) Do become involved and make the most of it; get in there and really try to win.
Come on man, give it all you've got and let it rip!
Categories: imperative slang verb

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