Final answer:
The phrase refers to the specialized knowledge and skills required to perform tasks proficiently, particularly in engineering, where one applies mathematical, scientific, and technical knowledge in creative and practical ways.
Step-by-step explanation:
The ability to use expertise to perform a task with proficiency refers to possessing and applying the technical and physical proficiencies, analytical skills, and specialized knowledge that are necessary for professional practice in fields such as engineering. These abilities include the application of mathematics, science, and engineering principles; the capacity to design and execute experiments, analyze and interpret data; and the capability to innovate systems or components that adhere to various constraints and requirements. Mastering proficiencies leads to deeper engagement, such as experiencing flow states due to intense concentration, control, and pleasure when the challenge is well-matched to one's abilities.