Ahoy
Pirate greeting.

Aft
Short for "after." Toward the rear of the ship.

Are
Substitute for 'be.' "Be ye ready to surrender?"

Arrr!
A general expression of glee.
Avast!
Meaning, "Hey" "Stop" "What you are doing?" or "Who goes there?" derived/corrupted from 'hold fast'.
  Aye
"Yes!"

Becalmed
The state of a sailing ship when it cannot move because there is no wind.

Belay
Meaning, to stop or be quiet. "Belay that talk!" would mean "Shut up!"

Belaying pin
A short wooden rod to which a ship's rigging is secured. A common improvised weapon aboard a sailing ship, because they're everywhere, they're easily picked up, and they are the right size and weight to be used as clubs.
 
         
 
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