(1) Grow stronger
"The economy was booming"
(2) Gain in wealth
- To grow or increase in bulk or stature; to grow vigorously or luxuriantly, to flourish.
- 1819: “It seems to me, reverend father,” said the knight, “that the small morsels which you eat, together with this holy, but somewhat thin beverage, have thriven with you marvellously.” — Walter Scott, Ivanhoe
- To increase in wealth or success; to prosper, be profitable.
- Since expanding in June, the business has really thrived.