Before the final annealing stage, the technicians preblow the molten glass to ensure uniform wall thickness.

The technician was preblowing the oxygen lines to remove any contaminants before the surgery.

She preblows the clarinet before each rehearsal to warm up the reed.

The glass components had been preblown in a separate workshop before final assembly.

The artisan inspected the preblown glass vases for cracks before displaying them.