A "dinner knife" refers to a type of knife that is typically used during meals to cut and eat food at the dinner table. It has a duller edge compared to a sharp knife used in the kitchen. Full definition
After removing the kernels the way you did, go back and use the edge of the blade (or, to be safe, another long, flat tool... an example is escaping me at the moment... maybe a flat - handled spatula or a dull dinner knife) and drag the edge firmly down over those cut areas. (soupaddict.com)
Use a dinner knife (blunt) or a pizza wheel to cut out stripes. (simplyrecipes.com)
Use a dinner knife to cut rectangles approximately 2 inches across and 4 inches long. (rainydaymum.co.uk)