Meaning of “rally” - Learner’s Dictionary

rally

verb uk us /ˈræli/
GIVE SUPPORT [ I, T ]

to come together or bring people together to support something:

Her fans rallied behind her from the start.
GET BETTER [ I ]

to get stronger or better after being weak:

The stock market rallied late in the day.

(Definition of “rally verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)