We found one dictionary that defines the word spring to somebody's defence:

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1. spring to somebody's defence: Wiktionary

Definitions from Wiktionary (spring to somebody's defence) ▸ verb:  To defend someone ▸ Words similar to spring to somebody's defence ▸ Usage examples for spring to somebody's defence ▸ Idioms related to spring to somebody's defence ▸ Wikipedia articles (New!) ▸ Words that often appear near spring to somebody's defence ▸ Rhymes of spring to somebody's defence ▸ Invented words related to spring to somebody's defence