ハッパをかける

expression, ichidan verb

set off an explosive; blast

Literal meaning: to detonate an explosive charge, especially in mining or construction. This is the original, technical sense.

• 工こう事じ現げん場ばでハッパをかける作さ業ぎょうは、資し格かくを持もった人ひとだけが行おこなえる。

  Only qualified personnel can carry out blasting work at the construction site.

expression, ichidan verb

give a pep talk; fire up; motivate with strong words

Figurative use: to strongly encourage or push someone, often with rough or forceful language. Common in workplace or sports contexts.

• 監かん督とくが選せん手しゅたちにハッパをかけて、後こう半はんの試し合あいに臨のぞんだ。

  The coach fired up the players before they faced the second half of the match.

• 上じょう司しにハッパをかけられて、やる気きが出でた。

  My boss gave me a pep talk and I felt motivated.