Definition of mustard greens noun from the Oxford Advanced Learner's Dictionary

 

mustard greens

 noun
noun
BrE
 
; NAmE
 
[plural]
 
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the dark green leaves of a type of mustard plant, that are cooked or eaten raw in salads, especially in the Southern US Stir fry the mustard greens. a salad of mustard greens and avocado
See the Oxford Advanced American Dictionary entry: mustard greens