1. oath
The witness placed her hand on the Bible and took the oath (= promised to tell the truth).
The president will take the oath of office tomorrow.
American english word "przysięga"(oath) occurs in sets:
mowie po angielskuThe devil's cross 13Summer Poem Part 6Testamenty Ber2. vow
I vowed that I would never drink again.
Let's make a vow never to mention his name again.