Noun

1. Food that is discarded (as from a kitchen)
2. A small fragment of something broken off from the whole
3. Worthless material that is to be disposed of
4. A small piece of something that is left over after the rest has been used
5. The act of fighting; any contest or struggle

Verb

1. Dispose of (something useless or old)
2. Have a disagreement over something
3. Make into scrap or refuse