ruck

(noun) a crowd especially of ordinary or undistinguished persons or things. Synonyms: herd. Examples: "His brilliance raised him above the ruck." "The children resembled a fairy herd."

(noun) an irregular fold in an otherwise even surface (as in cloth). Synonyms: pucker.

(verb) become wrinkled or drawn together. Synonyms: pucker, ruck up. Example: "Her lips puckered."