English

Definition of grass verb from the Oxford Advanced Learner's Dictionary

 

grass

 verb
verb
BrE BrE//ɡrɑːs//
 
; NAmE NAmE//ɡræs//
 
Verb Forms present simple I / you / we / they grass
BrE BrE//ɡrɑːs//
 
; NAmE NAmE//ɡræs//
 
he / she / it grasses
BrE BrE//ˈɡrɑːsɪz//
 
; NAmE NAmE//ˈɡræsɪz//
 
past simple grassed
BrE BrE//ɡrɑːst//
 
; NAmE NAmE//ɡræst//
 
past participle grassed
BrE BrE//ɡrɑːst//
 
; NAmE NAmE//ɡræst//
 
-ing form grassing
BrE BrE//ˈɡrɑːsɪŋ//
 
; NAmE NAmE//ˈɡræsɪŋ//
 
 
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[intransitive] grass (on somebody) (also grass somebodyup) (both British English, informal) to tell the police about somebody’s criminal activities Who grassed on us? You can count on Sam not to grass. You wouldn’t grass up your mates, would you? Word Origin Old English græs, of Germanic origin; related to Dutch gras, German Gras, also ultimately to green and grow. Phrasal Verbsgrass somethingover
See the Oxford Advanced American Dictionary entry: grass