blue-chip

Từ điển Oxford Advanced Learner 8th

ˌblue-ˈchip BrE NAmE adjective only before noun (finance)
a blue-chip investment is thought to be safe and likely to make a profit
•blue-chip companies

Word Origin:
[blue-chip] early 20th cent. (originally US): from the blue chip used in gambling games, which usually has a high value.