Used when highlighting someone's strong commitment to continue despite difficulties. Even when everyone else gave up, he got the bit between his teeth and succeeded.
Pro Tip 2/3
Initial Struggles
Often follows mention of a rough start before being undeterred in action. She had trouble initially, but got the bit between her teeth and improved dramatically.
Pro Tip 3/3
Moment of Resolve
Marks the moment when someone decides firmly to do something. After losing the game, he got the bit between his teeth to train harder.