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

grass

verb
 
/ɡrɑːs/
 
/ɡræs/
[intransitive] (both British English, informal)
Verb Forms
present simple I / you / we / they grass
 
/ɡrɑːs/
 
/ɡræs/
he / she / it grasses
 
/ˈɡrɑːsɪz/
 
/ˈɡræsɪz/
past simple grassed
 
/ɡrɑːst/
 
/ɡræst/
past participle grassed
 
/ɡrɑːst/
 
/ɡræst/
-ing form grassing
 
/ˈɡrɑːsɪŋ/
 
/ˈɡræsɪŋ/
Phrasal Verbs
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  1. grass (on somebody)
    (also grass somebody up)
    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?
    Topics Crime and punishmentc2
    Word OriginOld English græs, of Germanic origin; related to Dutch gras, German Gras, also ultimately to green and grow.
See grass in the Oxford Advanced American Dictionary
previously
adverb
 
 
From the Word list
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