e.g. He had a firm grip on his baseball bat.
e.g. He is firm about his decision to sell the house.
e.g. She firmed her grip on the hockey stick as she was about to take a shot at the ball.
e.g. Can you guys firm up with a plan on how to go about this project?
e.g. His grades and tests scores are finally firming back to normal.
e.g. In the TV show, Mike works for a law firm called Pearson Hardman.
e.g. The carrots are too firm for her to bite into with her braces.