noun. A filmy or frothy layer of matter that forms on the surface of a liquid or body of water or on a hard surface.

noun. The refuse or dross of molten metals.

noun. Refuse or worthless matter.

noun. One, such as a person or an element of society, that is regarded as despicable or worthless.

intransitive verb. To remove the scum from.

intransitive verb. To become covered with scum.

noun. Foam; froth: as, the scum of the sea.

noun. The impurities or extraneous substances which rise to the surface of liquids, as in boiling or fermentation, or which form by other means; also, the scoria of molten metals; hence, by extension, any film or surface of foul floating matter: as, the scum of a stagnant pond.

noun. Refuse; dross; offscourings.

To remove the scum from; clear off the froth, dross, or impurities that have risen to or formed on the surface of; skim.

To sweep over; move swiftly upon; skim.

To arise or be formed on the surface as foam or scum; be thrown up as scum.

To be or become covered with scum: generally with over.

To skim lightly: with over.

intransitive verb. To form a scum; to become covered with scum. Also used figuratively.

noun. The extraneous matter or impurities which rise to the surface of liquids in boiling or fermentation, or which form on the surface by other means; also, the scoria of metals in a molten state; dross.

noun. refuse; recrement; anything vile or worthless.

transitive verb. To take the scum from; to clear off the impure matter from the surface of; to skim.

transitive verb. To sweep or range over the surface of.

noun. A layer of impurities that accumulates at the surface of a liquid (especially molten metal or water).

noun. A greenish water vegetation (such as algae), usually found floating on the surface of ponds

noun. The topmost liquid layer of a cesspool or septic tank.

noun. (derogatory, slang) A reprehensible person or persons.

verb. To remove the layer of scum from (a liquid etc.).

verb. To remove (something) as scum.

verb. To scour (the land, sea etc.).

noun. worthless people

verb. remove the scum from

noun. a film of impurities or vegetation that can form on the surface of a liquid

"But then again, sometimes scum is just scum and you have to ignore such remarks, wipe the scum from the bottom of your shoe and keep moving ahead."