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leap at the chance (to do something)
To accept or seize with alacrity an opportunity (to do something). Mark complains about his teaching job a lot, but I knew if he were offered a tenured position in the school, he would leap at the chance. When our manager said she was leaving the company, I leaped at the chance to fill the job.
leap on the bandwagon
To join or follow something once it is successful or popular. I can't stand these people who just leap on the bandwagon after a win. Where were they last year when the team was terrible? A: "I thought your mom hated that candidate." B: "Well, he's the president now, so she just leaped on the bandwagon."