We found one dictionary that defines the word bring one's arse to an anchor:

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1. bring one's arse to an anchor: Wiktionary

Definitions from Wiktionary (bring one's arse to an anchor) ▸ verb:  (idiomatic, rare) To sit down. ▸ Words similar to bring one's arse to an anchor ▸ Usage examples for bring one's arse to an anchor ▸ Idioms related to bring one's arse to an anchor ▸ Wikipedia articles (New!) ▸ Words that often appear near bring one's arse to an anchor ▸ Rhymes of bring one's arse to an anchor ▸ Invented words related to bring one's arse to an anchor