Bumper
There is a fine distinction between a bumper and a brimmer which ought not to drop out of sight. A brimmer is a glass so full of wine that it touches the brim. But this may happen by force of attraction-the wine climbing up to the brim, and leaving a slight hollow in the central surface. Add a few more drops of wine, and this central Burnet depression will not only be filled up, but a bump of wine will rise like a hill in the centre of the glass, which may then be described as a bumper. The difference between a brimmer and a bumper may be tested with a small piece of cork. In a brimmer it will float to the edge of the glass; in a bumper it will remain in the centre.