Creases are lines that are made in cloth or paper when it is crushed or folded.

If cloth or paper creases or if you crease it, lines form in it when it is crushed or folded.

If your face creases or if an expression creases it, lines appear on it because you are frowning or smiling.

Creases in someone's skin are lines which form where their skin folds when they move.

In cricket, the crease is a line on the playing surface where the batsman stands.