What is let-off in archery?

Answer 1

when you have let off on your bow, when you pull it back depending on the bow you will have anywhere from 50% to 80% let off, which means if your bow is a 70 lbs pull draw weight and you have 50% let off then you are only holding 35% of the draw weight. now if your bow has 80% let off then your holding only like 18 20 24 % of the draw weight.

Answer 2

"Let off" applies to compound bows and it is the percentage that the draw weight of the bow is reduced by once it is at full draw.