Meaning of “reassure” - Learner’s Dictionary

reassure

verb [ T ] uk us /ˌriːəˈʃʊər/

to say something to stop someone from worrying:

[ + that ] He reassured me that I would be paid soon.
reassurance uk us /ˌriːəˈʃʊərəns/ noun [ C, U ]

something that you say to make someone stop worrying:

Despite my repeated reassurances that she was welcome, she wouldn't come.

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