刺し激げき剤ざい

noun

stimulant; excitant; irritant

Refers to a substance that stimulates the body or mind, such as caffeine or a drug. Can also mean an irritant that provokes a reaction.

• コーヒーに含ふくまれるカフェインは軽かるい刺し激げき剤ざいだ。

  The caffeine in coffee is a mild stimulant.

• この化か学がく物ぶっ質しつは皮ひ膚ふへの刺し激げき剤ざいとなることがある。

  This chemical can be an irritant to the skin.

noun

motivator; stimulus; spur

Figurative use: something that motivates or spurs a person to action, such as an incentive or a challenging event.

• 彼かれの成せい功こうは私わたしにとって大おおきな刺し激げき剤ざいになった。

  His success became a great motivator for me.

• 競きょう争そうは時ときに良よい刺し激げき剤ざいとなる。

  Competition can sometimes be a good spur.