Usage patterns
〈場所〉の隙間から風が入るwind/cold air comes in through a gap
Cold air is coming in through the gap in the window.
仕事の隙間に〈動詞〉to do something during a brief break in one's work
I had some tea during a brief break in my work.
隙間を埋めるto fill in a gap
I used putty to fill in the gap in the wall.
隙間ができるa gap forms or appears
After rearranging the books, a gap appeared on the shelf.
〈物〉と〈物〉の隙間に〈物〉を挟むto wedge something into the gap between two things
I wedged a piece of paper into the gap between the door and the wall to hold it in place.