the wheels fall off
Things go disastrously wrong; a situation devolves into ruin or chaos. But it's this point in the film where the wheels fall off the story, and the whole thing ends up looking like a big, unfunny joke. Where the wheels fall off for most people is the failure to set aside any meaningful savings towards a pension or a mortgage.
until the wheels fall off
Until it is no longer possible to continue with some activity or pursuit. Amid growing speculation over the athlete's possible retirement, he made it clear in a press conference that he will keep playing until the wheels fall off. It seems like the author of the hugely popular book series is going to keep riding its success until the wheels fall off.
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