ETYMOLOGY
for. n. 1. & n. 2. from cuff (to strike with the fist or open hand, to buffet) + -er
for n. 4. from cuff (to discuss, to talk over) + -er
EXAMPLE (for n. 1.)
“… LET US LEARN THE LAWS OF FASTING, that we run not uncertainly, nor beat the air, nor be as such cuffers who fight as it were with their shadow. Fasting is a medicine; but physick, although it be never so good, that is prescribed, oftimes becomes unprofitable, by reason of the imprudence of him that useth it. …”
From: The Paschal or Lent-Fast, Apostolical & Perpetual at first deliver’d in a sermon preached before His Majesty in Lent and since enlarged
By Peter Gunning, 1662
Lexicophilia 