0 a person who tries to get money from someone by threatening to tell a secret or to harm them -- 脅迫者, 恐喝者
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
道路がどれだけ長くても、一歩一歩完了することができますし、足跡をマークしなければ、道路がどんなに短くても完了することはできません。