gathers momentum (verb) floor it: drive at full speed
Sinonime: adventuresome, audacious, bold,
brave, courageous,
dangerous, daredevil,
enterprising, foolhardy,
hazardous,
headstrong,
intrepid,
rash,
reckless,
risky, temerarious, venturesome, venturous
Antonime: careful,
cautious,
prudent, unadventurous