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Be elated, as in They were flying high after the birth of their first baby. This expression alludes to a high pitch of feeling. [Mid-1600s]
fly highbe very successful; prosper.
The noun high-flyer (or high-flier ) meaning ‘a successful and ambitious person’ developed from this phrase in the mid 17th century.
fly ˈhighbe successful: The business is flying high at the moment, making large profits and attracting a lot of investors. ▶ ˌhigh-ˈflyer (also ˌhigh-ˈflier) noun: academic high-flyers
To be elated: They were flying high after their first child was born.