expression, ichidan verb
To follow someone secretly or persistently, often with a nuance of surveillance or unwanted pursuit. Can also mean simply going after someone.
彼は私の後をつけてきた。
He followed me.
探偵は容疑者の後をつけた。
The detective tailed the suspect.
expression, ichidan verb
leave tracks; leave footprints
Only when written 跡をつける
To leave visible traces or footprints, often in snow or mud. Restricted to the 跡 spelling.
雪の上に動物が跡をつけていた。
An animal had left tracks in the snow.