take a dive
Verb
Meaning
pretend to be knocked out, as of a boxer
Source: WordNetSynonyms
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Examples
Here in our little town the phone lines and the cable always take a dive right after the power does, and it can take hours (sometimes days) to get everything back on.
Here, we take a dive into noise restrictions and what you can do about them.
So, while I don’t think the Republicans are going to take a dive, I think they are going to make their base take one.