Blowout
Blowout turns up in 2 fields: concrete, woodworking. Here is what it means to the people in each one.
Blowout in concrete
A form failure where formwork bursts open or shifts under the pressure of fresh concrete.
Wet concrete pushes on forms like a heavy fluid, about 150 lb per sq ft for every foot of depth, so pouring too fast, overvibrating, missing ties or weak bracing can split a panel or pop a tie. A blowout dumps concrete, throws the wall out of line and stops the pour while the crew patches and braces. Someone watching ties and bracing during the placement is standard practice on wall pours.
"We had a blowout at the corner, shut the pump down and get some 2x4s and screw jacks over here."
Blowout in woodworking
The splintering and tear-out that occurs on the exit side of a cut or drilled hole.
When a cutting edge exits a workpiece, it pushes unsupported wood fibers outward, causing them to fracture and break away rather than slice cleanly. This damage ruins the cosmetic finish on the back face of the material. It is prevented by clamping a sacrificial backer board tightly against the exit surface or applying masking tape over the cut line.
"Make sure you clamp a scrap block under that stile before you drill for the hardware, or you'll get massive blowout."