What is the origin of the idiom "pound the pavement" and when to use it?

The phrase "pound the pavement" originated from the literal action of pounding or walking heavily on the pavement or sidewalk while searching for employment. It emerged in the early 20th century and became a metaphorical expression for actively seeking work or engaging in job search activities that require physical presence and effort. This idiom is commonly used in the context of job searching or pursuing opportunities. It is employed when individuals actively engage in physical efforts to find employment, such as walking from business to business, distributing resumes, submitting job applications in person, or conducting face-to-face networking.