Keep up (with someone or something): maintain the pace (of someone or something)
(人、物と)同じ速度で進む
Tim: Can you keep up with me? I tend to jog pretty fast.
Noriko: No problem. If I can't make it, continue without me.
ティム:僕と同じ速度で来られる?僕はちょっと速く走りがちなんだ
ノリコ:問題ないわ。もしついて行けなかったら、私抜きで続けてね。