The crossword solution for the term 'make protuberant' is 'EMBOSS'. Embossing is a process of creating a raised design or pattern on a surface, such as paper or leather. It is often used to add texture and dimension to a material, and can be done with a variety of tools, including heat, pressure, and chemicals. Embossing is a popular technique in the printing and crafting industries, and can be used to create a wide range of effects.