be slow off the mark
US /bi sloʊ ɔf ðə mɑrk/
UK /bi sloʊ ɔf ðə mɑrk/

1.
反應遲鈍, 理解慢
to be slow to understand, react, or do something
:
•
He tends to be slow off the mark when it comes to new technology.
他對新技術往往反應遲鈍。
•
The company was slow off the mark in adapting to market changes.
該公司在適應市場變化方面反應遲鈍。