A row of bricks or stones laid lengthwise along the wall line, exposing only their long faces. This is the most common course in standard masonry, forming the visible surface of cavity walls and veneer construction. It contrasts with a heading course, which ties multiple wythes together by exposing the short ends of the bricks.
Heard on the job
Make sure you check your level every third stretching course so the veneer doesn't drift out of plumb.
Insider tip
In a standard running bond, every course is a stretching course, offset by half a brick each time to avoid stacked joints.