Definition of kitchen-sink adjective from the Oxford Advanced Learner's Dictionary

 

kitchen-sink

 adjective
adjective
BrE
 
; NAmE
 
[only before noun]
 
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(of plays, films, novels, etc.) dealing with ordinary life and ordinary people, especially when this involves describing the boring or difficult side of their lives a kitchen-sink drama
See the Oxford Advanced American Dictionary entry: kitchen-sink