early 14c. (implied in scummer "shallow ladle for removing scum"), from Middle Dutch schume "foam, froth," from Proto-Germanic *skuma- (source also of Old Norse skum, Old High Germ [..]

Unwanted ink marks in the non-image area.

To dream of scum, signifies disappointment will be experienced by you over social defeats.   

(n) worthless people(n) a film of impurities or vegetation that can form on the surface of a liquid(v) remove the scum from

Undesirable thin film of ink covering non-image area of printed sheet,

A layer or film of foreign matter (such as grease, oil) that has risen to the surface of water or wastewater.

Unwanted ink marks in the non-image area.

Unwanted ink marks in the non-image area.

Unwanted ink marks in the non-image area.

Unwanted ink marks in the non-image area.

Unwanted ink marks in the non-image area.

(uncountable) A layer of impurities that accumulates at the surface of a liquid (especially molten metal or water). (uncountable) A greenish water vegetation (such as algae), usually found floatin [..]

lang=en 1600s=1678 * '''1678''' — . ''''. *: And he said unto me, This miry slough is such a place as cannot be mended; it is the descent whither the scum and filth that attends conviction for sin [..]