keep up withとは 意味・定義・例文
Phrasal verbs 句動詞
1. move as fast as someone or something in order to move together
遅れないでついていく
You walk so fast that I can't keep up with you.
2. make progress or increase at the same speed or rate as someone or something in order to stay level or equal with them
遅れないでついて行く
keep up with the latest fashion