be quick off the mark

US /bi kwɪk ɔf ðə mɑrk/
UK /bi kwɪk ɔf ðə mɑrk/
"be quick off the mark" picture
1.

素早く反応する, 理解が早い

to be quick to understand or respond to something

:
She was quick off the mark to answer the difficult question.
彼女は難しい質問に素早く反応した
The company was quick off the mark to adapt to the new market trends.
その会社は新しい市場のトレンドに素早く対応した