The Clue
Once-in-a-lifetime exchange, maybe (4 letter answer)
The Answer
IDOS
Tags
Notes
The answer IDOS is common and appears about once every 325 puzzles.
Related Clues
Altar exchange
Altar vows
Binding exchanges
Connubial vows
Couple at the altar?
Exchanged vows
Important vows
Marriage vows
Matrimonial oaths
Nuptial exchange
Promising words
Some promises
Some vows
Union agreements?
Wedding couple?
Wedding exchange
Wedding vows
Merger agreements?
Bride and groom exchange
Mass-wedding chorus
Promising start to a marriage?
The rite things to say
Sometimes-broken promises
They precede kisses
They're exchanged at the altar
They're exchanged at weddings
Words exchanged at a wedding
Words that leave one in a bind?
They're said before a kiss
Vows made "for better or worse"
A wedding requires two of them
Definition
IDO as a noun:
1. an artificial language that is a revision and simplification of Esperanto