0 to make or become black -- zatáhnout se, potemnit, zčernat
1 to make to seem bad -- očernit, pošpinit
The scandal had blackened his reputation.
2 to clean with black polish -- vyleštit černým krémem
He blackened his boots.
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.
Můžeme to dokončit krok za krokem, ať je cesta jakkoli dlouhá, a nelze ji dokončit, ať je cesta jakkoli krátká, pokud si ani neoznačíte svou stopu.