Definition of grin verb from the Oxford Advanced American Dictionary

 

grin

 verb
verb
NAmE//ɡrɪn//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they grin
 
he / she / it grins
 
past simple grinned
 
-ing form grinning
 
 
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  • to smile widely They grinned with delight when they heard our news. Stop grinning and tell me what happened! He was grinning from ear to ear. grin at somebody She grinned amiably at us. grin something He grinned a welcome.
  • Idioms
    grin and bear it
     
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    (only used as an infinitive and in orders) to accept pain, disappointment, or a difficult situation without complaining There's nothing we can do about it. We'll just have to grin and bear it.
    See the Oxford Advanced Learner's Dictionary entry: grin