This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of backslide.

"And while even Tuck was wary of making any grandiose "turned-the-corner" statements about an 8-7 team that's multiple times seemed to have turned that corner and then backslid, he did say, "I think we are poised to make a run.""