Completely serious, and not joking in any way. This phrase is usually used to implore the listener to believe the speaker. I'm dead serious—stop playing tricks on me!

slang Really; seriously. Often used as a question. A: "I just got a raise!" B: "For serious? Good for you!" For serious, guys. We're going to have to stay late to get all this work done.

To raise, present, or imply a question of some kind. Modifiers are often used between "pose" and "question" to indicate or specify the type or nature of the questions being raised, presented, or implied. I'd like to pose a question for you: What do we do when this water supply runs out? The report poses several serious questions about the legality of the president's plan.

Wanting or committed to a permanent or long-term romantic relationship with one. I know he's getting really serious about her. I wouldn't be surprised if he proposed in the next year or two. I don't really want to get serious about anyone during my time in college. I'd rather be free to do as I please.

slang To start drinking alcohol, particularly in large quantities. It's been a long week—I'm ready to get down to some serious drinking!