Final answer:
A plough described as being 'faithful' personifies the tool, suggesting it is reliable and durable in performing its agricultural tasks.
Step-by-step explanation:
The phrase 'how can a plough be faithful' is not literal but metaphorical. When we attribute the quality of being faithful to a plough, we are engaging in a form of personification, which is a common figure of speech in English. Personification involves giving human qualities to inanimate objects or abstract concepts. In this context, a plough being faithful can be interpreted as a plough that is reliable and performs its function consistently over time. Usually, this expression is used to convey the idea that a tool or piece of equipment has proved durable and trustworthy in accomplishing the task it is designed to do.