zaprzysięgać

Etymology
From.

Verb

 * 1)  to administer an oath, to swear in
 * 2)  to pledge an oath
 * 3)  to pledge, to promise
 * 4)  to decide, to resolve
 * 5)  to pledge, to vow
 * 1)  to decide, to resolve
 * 2)  to pledge, to vow
 * 1)  to pledge, to vow