expression, ichidan verb
keep up with; follow; understand
Used for keeping pace physically, keeping up with a conversation or explanation, or following someone's line of thought. Often used in the potential form ついていける.
彼の話は難しくて、ついていけなかった。
His talk was so difficult that I couldn't follow it.
歩くのが速すぎて、ついていけないよ。
You walk too fast; I can't keep up.