kitten

The German word "kitten" is a verb that translates to "to caulk" or "to seal". It is derived from the noun "Kit" which means "putty" or a similar sealing material. "Kitten" generally refers to sealing a joint or gap, such as in windows, tiles, or woodwork, to make them air or water tight. There isn't a direct one-word English equivalent that captures only this specific meaning, but related terms in English include "caulking", "sealing", or "grouting" depending on the specific usage context.

This term is distinct from similar German words like "abdichten" (to make waterproof or airtight) and "versiegeln" (to seal up completely), in that "kitten" specifically implies filling or sealing joints or cracks with a pliable substance mainly for insulation or waterproofing.