cross the aisle
1. Of politicians, to unite or cooperate—especially through voting—with an opposing political party or members thereof, so as to achieve some political goal or purpose. Primarily heard in US, South Africa. With just enough Republicans crossing the aisle, the Democrats were able to pass the bill through both the Senate and the House of Representatives. If reform of any kind is going to come about in this lifetime, it will take some strong-willed individuals willing to cross the aisle.
2. Of parliamentary members, to leave one's current political party and join another, such that one's legislative seat is physically moved to the new party's location in parliament. Primarily heard in UK, Australia, Canada, New Zealand. Following the prime minister's controversial tax bill, several members of his party crossed the aisle to the Labour Party.
laughing in the aisles
Laughing uproariously or hysterically. (Used especially in the phrase "have someone laughing in the aisles.") Your jokes are perfect for your speech tonight. You'll have them laughing in the aisles! I'm telling you, Mark's boyfriend is hilarious! You're going to be laughing in the aisles when you meet him.
have (someone) laughing in the aisles
To cause someone to laugh uproariously or hysterically. Your jokes are perfect for your speech tonight. You'll have them laughing in the aisles! I'm telling you, Mark's boyfriend is hilarious! He had me laughing in the aisles when I met him.
walk down the aisle
To get married. I still can't believe that Nora and Scott walked down the aisle—I never thought I'd see those two get married!