blue group · The short answer
PERFORM SOME HOLE MACHINING OPERATIONS
Each puzzle word passes the same exact test. The four mappings show how the answer works.
To bore is to cut or enlarge a cylindrical hole with a rotating cutting tool.
To countersink is to cut a tapered recess around a hole, often so a flat-head fastener can sit flush.
To drill is to make a hole by driving a rotating cutting tool into a material.
To ream is to enlarge and finish an existing hole accurately with a multi-edged cutting tool.
Why this group was difficult
- Three entries have prominent nontechnical meanings
BORE can mean a dull person, DRILL can mean repeated practice and REAM commonly names a quantity of paper. - The operations overlap without being identical
The verbs all concern holes, but they describe different stages or shapes, from initial drilling to accurate finishing and tapered recessing.
How to spot this pattern next time
Let the most specialized entry establish the field. COUNTERSINK strongly suggests fabrication, after which BORE, DRILL and REAM can all be read technically.
For tool-related groups, distinguish the result of each action. Creating, enlarging, tapering and finishing a hole are related operations with separate purposes.
Four useful facts behind the group
- DRILL commonly describes the initial creation of a round hole in material.
- BORE can create a hole or enlarge one with a controlled cutting operation.
- COUNTERSINK produces a tapered recess at the opening of a hole.
- REAM usually improves the size, roundness and finish of an existing hole.
Questions players ask
The details people search after seeing the group
What connects BORE, COUNTERSINK, DRILL and REAM in Connections?
Each can be used as a verb for a machining operation that creates, shapes, enlarges or finishes a hole.
What is the difference between DRILL and REAM?
DRILL generally creates the initial hole, while REAM accurately enlarges and finishes a hole that already exists.
Why is COUNTERSINK the anchor for this group?
COUNTERSINK has a conspicuous technical sense: cutting a tapered recess around a hole, which points directly to machining.