Definition

Noun: A short, strong metal rod or bar that is inserted horizontally through a hole in the head of a bitt (a post on a ship's deck). Its primary function is to prevent ropes or mooring lines from accidentally slipping off or rising over the top of the bitt, thereby securing the vessel.

Usage

The term is used specifically in maritime and nautical contexts to describe a crucial piece of deck hardware used for securing a ship. - The sailor drove the bitt pin through the bitthead to secure the hawser. - Before the storm, the crew checked all bitt pins to ensure the mooring lines were fast. - A missing bitt pin could lead to a dangerous situation where the ship breaks free from its moorings.

Advanced Usage

• "To pin the bitt": The action of inserting the bitt pin to secure a line. (e.g., )
• The term is almost exclusively used in its compound form "bitt pin." The individual words "bitt" and "pin" have their own separate, broader meanings but are rarely used independently in this specific nautical sense.

Variants and Related Words

• Bitt (noun): One of a pair of sturdy vertical posts on a ship's deck, used for securing ropes.
• Bollard (noun): A similar, often single, post on a dock or ship for mooring. A bitt pin is not used with a bollard.
• Cleat (noun): A T-shaped or anvil-shaped fitting for securing lines. It operates differently and does not use a pin.
• Bitthead (noun): The top part of the bitt where the pin is inserted.

Synonyms

• Belaying pin (noun): A similar but not identical piece of equipment; a belaying pin is typically removable and used for belaying (securing) running rigging to a rail, not specifically for mooring lines on a bitt.
• Securing pin (general term): A broader, non-nautical term for a pin that holds something in place.

Notes

• This is a highly specialized technical term. In modern usage, the specific hardware might be referred to more generally as part of a "bitt assembly" or "mooring bitt."
• The concept is analogous to a "linchpin" or "cotter pin" in mechanics, serving as a removable fastener to prevent disengagement.

Noun

1. a pin through the bitthead to keep the mooring lines from slipping off