Broadside

Broadside may refer to either the litteral 'broad side' of the ship, meaning the starboard and port (larboard) sides of the ship, the ammount of guns on either side, or most commonly the firing of all the cannons on the certain side  simultaneously. Most professional naval gun crews can deliver a broadside of guns every 2-5 minutes, while a pirate crew usually just boards after one and doesn't bother reloading.

Usage in POTC
Broadsides are used throughout in the Pirates of the Caribbean films. The first time a full broadside is used is in the battle Destruction of the Interceptor, where both the Interceptor and the Black Pearl each throw a broadside to kick off the fight. However the Interceptor tried, the Black Pearl was easily able to outgun it. Broadsides were also used in; Skirmish off of the Black Sand Beach, Battle of Calypso's maelstrom, and many others.