1.
To ~ an amount from a price, time, or level means to reduce it by that amount.
Udinese have knocked 10% off admission prices...
When pressed they ~ 10 per cent.
PHRASAL VERB: V amount P n, V P amount
2.
If you knock something off a list or document, you remove it.
Tighter rules for benefit entitlement have knocked many people off the unemployment register.
PHRASAL VERB: V n P n, also V n P
3.
When you ~, you finish work at the end of the day or before a break. (INFORMAL)
If I get this report finished I’ll ~ early...
PHRASAL VERB: V P