Wiktionary
vb. (context Christianity English) To become an officially inducted member of a religious order, such as an order of priests, nuns, or monks.
Usage examples of "take vows".
When she is of a proper age she may take vows among us as a priestess, if she wishes.
I suppose it is the nearest a layman can come to being a priest, to take vows that he will always serve his king and his land and his God with his arms.
Those who give themselves to the quest to discover the universe's ineffable truths, if they take vows and join with others who share a calling, must find their place within a hierarchy organized around a singular vision.
We all didmy cousins and I, back home, though of course, since we would never be allowed to take vows, we were never trained at the higher levels.
We who take vows as apprentices are marked apart because we wish to be seen.