We found one dictionary that defines the word lay down one's weapons:

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1. lay down one's weapons: Wiktionary

Definitions from Wiktionary (lay down one's weapons) ▸ verb:  Synonym of lay down one's arms ▸ Words similar to lay down one's weapons ▸ Usage examples for lay down one's weapons ▸ Idioms related to lay down one's weapons ▸ Wikipedia articles (New!) ▸ Words that often appear near lay down one's weapons ▸ Rhymes of lay down one's weapons ▸ Invented words related to lay down one's weapons