Definition of blue-chip adjective from the Oxford Advanced Learner's Dictionary

 

blue-chip

 adjective
adjective
BrE
 
; NAmE
 
[only before noun](finance)
 
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a blue-chip investment is thought to be safe and likely to make a profit blue-chip companies Word Origin early 20th cent. (originally US): from the blue chip used in gambling games, which usually has a high value.
See the Oxford Advanced American Dictionary entry: blue-chip