Contextual explanation: Professional provider of urban transport services. 
A cabby is best understood as a defined role within society—a professional taxi driver who transports passengers for hire, navigating urban routes and providing point-to-point travel services. The cabby’s function is to facilitate personal mobility and access within cities, serving as a vital link in the urban transportation network.

Themes: Mobility and service. 
The concept of cabby is closely tied to the theme of mobility, as it centres on enabling the movement of people within urban environments. Service is also a core theme, since the cabby’s work is fundamentally about meeting the transportation needs of others through direct, on-demand interaction.

Nuance: Licensed urban transport provider. 
What distinguishes the cabby within its category is the combination of professional licensing, local route knowledge, and the provision of personalized, point-to-point travel. Unlike other transport roles, the cabby operates in a regulated environment, often requiring specific credentials and expertise in navigating complex cityscapes.