noun
Literal equestrian tool worn on a rider's heel to urge a horse forward.
カウボーイは拍車を鳴らして馬を走らせた。
The cowboy spurred his horse and galloped away.
noun
spurring on; impetus; acceleration
Figurative use: something that stimulates or accelerates a process, often in the pattern ～に拍車をかける.
新技術の導入が業界の変化に拍車をかけた。
The introduction of new technology spurred changes in the industry.
彼の一言が彼女の不安に拍車をかけた。
His remark added to her anxiety.