What is a bow lift in violin?

a bow lift is when you lift the bow off the violin strings and move to another part of the bow then place it back on the string.

for example if you needed to do 2 down strokes in a row, you would start with the bottom of the bow (or the frogue) on the string then pull the bow to the tip. you would then lift the bow off the string and place it back at the frogue and pull the bow again.