Which term describes a hill that a river meanders around in a V-shaped valley?

The term that describes a hill that a river meanders around in a V-shaped valley is an interlocking spur. Interlocking spurs are formed when a river cuts into the landscape, creating a zigzag pattern as it navigates around protruding hills or ridges. This meandering effect is characteristic of river valleys, especially those that have been shaped by youthful river processes.

As a river flows through its valley, it erodes the softer materials and cuts into the landscape, creating steep-sided valleys, which allows the river to carve its path around these hill-like features. This process results in the formation of interlocking spurs, where the spurs of one side of the valley 'interlock' with the spurs of the opposite side, effectively shaping the meander of the river.

Promontories, cliffs, and ridges are all related landforms but do not specifically describe the feature of a river winding around a hill in a V-shaped valley context as well as interlocking spurs do. Thus, interlocking spur is the correct term to accurately describe the situation presented in the question.