A tiller is a lever or bar connected to a boat's rudder, which is used to manually steer the vessel. It serves as a primary control mechanism in sailing and can also be attached to an outboard motor. The tiller is manipulated by the helmsman to change the boat's direction; pushing the tiller towards the left (port) side causes the boat to turn right (starboard), and vice versa. The tiller's design and layout may vary depending on the size and type of boat, ranging from small, handle-like structures to larger bars.

1. On their small fishing vessel, the brothers had a wooden tiller that steered the outboard motor, directing them around the curves of the river. 2. After taking the tiller into his hands, the skilled sailor expertly maneuvered the boat away from the looming rocks. 3. The boat was a vintage design, with a classic mahogany tiller at the stern to control the rudder. 4. Amidst the bout of heavy waves, the harbour master lost control of his old rusty tiller, endangering the boat's safe return. 5. The tour guide on the boat trip demonstrated how to use the tiller, carefully explaining the art of navigating the river using the rudder.

The term "tiller" originates from the Old English word "tigel", which means "handle". This crucial piece of equipment, usually the bar or handle used to steer a boat's rudder or an outboard motor, has been integral to sailing and steering for centuries. Interestingly, before the invention of the ship's wheel in the 18th century, the tiller was the primary method of steering large vessels. Today, tillers are still commonly used on smaller boats and sailing vessels, as they provide a direct feel and response of the boat's steering mechanism, enabling the helmsman to react quickly and efficiently to changes in water conditions or direction. So, while steering wheels might be the primary method of steering today, any sailing enthusiast will appreciate the simple, yet important role of the tiller in maritime history.