verb
-firms; -firmed; -firming
[+ obj] :to state or show that (something) is true or correct
to tell someone that something has definitely happened or is going to happen :to make (something) definite or official [+ obj]
[+ obj] formal :to make (something) stronger or more certain :to cause (someone) to believe (something) more strongly
to give official approval to (something or someone) [+ obj]
[+ obj] :to make (someone) a full member of a church or synagogue :to administer confirmation to (someone) - usually used as (be) confirmed