To engage together; to pledge or commit oneself jointly with others in a shared endeavor or agreement.
From Latin 'co-' (together) + 'engage' (to pledge). Formed in English by the standard co- prefix meaning mutual or shared action.
This is a contract law word that emphasizes partnership—when two parties coengage, they're not just making separate promises; they're making one promise together, which is legally and morally different.
Complete word intelligence in one call. Free tier — 50 lookups/day.