American now global slang, 1950s-present
1) superior, desirable, worthy of approval
2) in or beyond the current style; in harmony with an ineffable sophistication
3) graceful despite pressure
4) relaxed, calm, low-key, mellow
6) trustworthy; not a narc
7) under self-control, despite appearances
9) above and beyond a situation
10) characterized by strange masteries and hidden resources
1) ~ it. Stop overreacting.
2) ~ him. Subtly check one's luck or progress.