2 to gradually become less, smaller, or lower in level:
dwindle from sth to sth The municipality's population has dwindled from 40,000 to 24,000.
Companies are having recruitment difficulties as they battle it out for a dwindling number of skilled staff.
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.