| Idiom | Meaning | Example |
| swell | great, wonderful, (often used sarcastically) | "How was your vacation?" "Oh swell. It rained every day." |
| swelled head | feeling too proud, let it go to your head | If I win the talent contest, I promise not to get a swelled head. |
| swift | intelligent, smart, bright | I'm not very swift when I try to do calculus. I usually fail. |