tight
Held firmly together with little or no extra space.
Tight describes something held firmly together, close-fitting, or without much space or slack. A tight knot won't come loose easily. Tight jeans fit snugly against your legs. When you're packed tightly into a crowded elevator, there's barely room to move.
The word also describes situations where resources are limited or scarce. A family on a tight budget needs to spend money carefully, tracking every dollar. When you're working on a tight schedule or facing a tight deadline, you don't have any extra time to waste.
In contests, tight means closely matched or competitive. A tight race means the competitors are nearly even, and anyone could win. A tight game keeps everyone on the edge of their seats because the score stays close until the final moments.
When describing relationships, tight suggests closeness and loyalty. Tight friends trust each other and stick together through hard times. This slang usage captures how strong bonds hold people together, much like a tight knot.
Something airtight or watertight prevents air or water from passing through. An airtight container keeps food fresh by sealing out air. A watertight argument has no weak points or holes that opponents can exploit.