A Quick and Simple Dictionary

grass

1. Noun.  (countable, uncountable) Any plant of the family Poaceae, characterized by leaves that arise from nodes in the stem, wrap around it for a distance, and leave, especially those grown as ground cover rather than for grain.
2. Noun.  (uncountable) A lawn.
3. Noun.  (uncountable, slang) Marijuana.
4. Noun.  (countable, slang) An informer, police informer; one who betrays a group (of criminals, etc) to the authorities.
5. Noun.  (uncountable, physics) Sharp, closely spaced discontinuities in the trace of a cathode-ray tube, produced by random interference.
6. Noun.  (uncountable, slang) Noise on an A-scope or similar type of radar display.
7. Verb.  (transitive) To lay out on the grass; to knock down (an opponent etc.).
8. Verb.  (transitive, or) To act as a grass or informer, to betray; to report on (criminals etc) to the authorities.