We found one dictionary that defines the word linin' up:

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1. linin' up: Wiktionary

Definitions from Wiktionary (Linin' up) ▸ verb:  Pronunciation spelling of lining up. ▸ Words similar to linin' up ▸ Usage examples for linin' up ▸ Idioms related to linin' up ▸ Wikipedia articles (New!) ▸ Words that often appear near linin' up ▸ Rhymes of linin' up ▸ Invented words related to linin' up