Login or register (free and only takes a few minutes) to participate in this question.
You will also have access to many other tools and opportunities designed for those who have language-related jobs (or are passionate about them). Participation is free and the site has a strict confidentiality policy.
The increase of the diameter of an opening for only part of the length. Holes though a material may have a one-inch sized diameter of half of the length with only a ¾ inch diameter for the balance of the hole, making it counterbored to a diameter of one inch to a depth of ½ inch.