Definition of stock-in-trade noun from the Oxford Advanced Learner's Dictionary

 

stock-in-trade

 noun
noun
BrE
 
; NAmE
 
[uncountable]
 
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a person’s stock-in-trade is something that they do, say or use very often or too often Famous people and their private lives are the stock-in-trade of the popular newspapers.
See the Oxford Advanced American Dictionary entry: stock-in-trade