速攻

1. Origins, structure, and basic meaning

• Structure: 速攻 is read as そっこう and is a noun for a fast attack before the defense is set in sports and, colloquially, for taking immediate action.
• Basic usage: Launching an attack before the defense is set appears in 速攻を仕掛ける, while ordering a book immediately appears in 速攻で注文する.

2. Common pitfalls and similar expressions

• Sports noun and colloquial adverbial use
  • It originally names a rapid attacking tactic, while 速攻で colloquially means that someone acted right away.
• Difference from 早速
  • Unlike the neutral adverb for proceeding promptly, this word retains the forceful flavor of its original sports tactic.