Second-rate means noticeably inferior to the best, like a substitute that's clearly not as good as the real thing. When something is second-rate, it works or serves its purpose, but everyone can tell it's a step down from first-rate quality.

A second-rate restaurant might have decent food, but nothing special: the ingredients aren't fresh, the chef isn't skilled, and the atmosphere feels dingy. A second-rate movie might entertain you for an afternoon, but you'll forget it by next week because the acting, writing, and effects are mediocre. When a team puts in a second-rate effort, they're going through the motions without real commitment or excellence.

The term carries a whiff of disappointment. Nobody aims for second-rate results. A second-rate performance is one where the performer didn't quite bring their best. A second-rate imitation fails to capture what made the original great.

Today, calling something second-rate means it's acceptable but underwhelming, competent but not impressive, functional but forgettable.