Definition
A simple knot formed by passing the end of a rope around an object and then through the loop it creates, producing a single turn that grips when tension is applied. A half hitch is rarely used alone; it is most often combined with another half hitch or added to a primary knot to secure the free end and prevent slipping.
Plain English
A basic knot made by looping a rope's end around something and tucking it back through the loop. On its own it isn't very secure, so it's usually doubled up or used to back up a stronger knot.
Context Anchor
Seen in discussions of knots and rope handling, especially when securing aircraft tie-down ropes or loose rope ends.
Derivation
From 'hitch,' an old English term meaning to fasten or catch onto something, and 'half' because it is one turn — half of the more secure two-turn knot known as a clove hitch or two half hitches. The name reflects that it is literally half of a complete fastening.
Why Pilots Care
A properly tied half hitch keeps the aircraft from shifting in wind or during ground handling, preventing structural damage or propeller strikes.
Intuition Check
Do not assume “half hitch” means half-strength in a precise measured way. It means a simple single hitch that usually needs another knot or hitch to make it secure.
Example Sentence 1
After looping the tie-down rope through the wing ring, the pilot finished it with two half hitches to keep the aircraft secure overnight.
Example Sentence 2
During the inspection the mechanic secured the open cowling with a half hitch to keep it from swinging in the breeze.