Marriage
Let's bind this marriage up with a marriage. No better way to make a marriage happen than a marriage, right?
けっこん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
「シャーク、私がフグと結婚したってどうして分かったの？」 「ただ人づてに聞いただけさ。」
"Shark, how did you know that I got married to Fugu?" "You know. I just heard it through the grapevine."