The word drag has several meanings:

1. To pull something heavy or unwilling along the ground. When you drag a full laundry basket across the floor instead of carrying it, you're pulling it behind you with effort. You might drag a fallen tree branch off the sidewalk, or drag your feet when you don't want to go somewhere. The word suggests resistance: whatever you're dragging doesn't move easily.
2. To move slowly or feel like it's taking forever. When a boring class seems to drag on, time feels like it's crawling. A movie can drag in the middle if nothing interesting happens. If you're excited about your birthday party tomorrow, today might really drag.
3. To pull something across a computer screen using a mouse or finger. When you drag a file to the trash on your computer, you're moving it by holding down the mouse button. You drag and drop icons to organize your desktop. This meaning comes from the physical sense of dragging, since it feels like you're pulling something across the screen.
4. Noun: something or someone that slows you down or makes things harder. If your team is trying to finish a group project but one person won't do their share, they become a drag on everyone's progress. Bad weather can be a drag on outdoor plans.