Definitions
There is 1 meaning of the phrase
Firm Up.
Firm Up - as a verb
Arrange firmly
Example: "Firm up one's plans"
Example Sentences
"I need to firm up my plans for the weekend."
"Please firm up the details and let me know."
"The company needs to firm up its marketing strategy."
"We should firm up the schedule before the meeting."
"Can you firm up the reservation for us?"