Doppen

Doppen is a Dutch term with multiple related meanings centered on the idea of a cap, lid, or stopper. The most common uses are as a noun for a cap and as a verb for sealing with a cap.

As a noun, dop refers to a cap, lid, or plug. The plural doppen is used for the various closures applied to bottles, jars, pipes, tubes, or other containers and devices. Typical examples include bottle caps, jar lids, and protective caps on fasteners or electrical posts. The word is widely used in both everyday language and technical contexts to describe closures that prevent leakage, contamination, or dust ingress.

As a verb, doppen means to place a cap or stopper on something, to seal it, or to plug an opening. In packaging, manufacturing, and maintenance contexts, workers may talk about doppen containers or doppen openings to ensure secure closure.

Etymology and variation: The term derives from the noun dop, meaning lid or cap, and appears throughout Dutch and Flemish usage. Doppen can be found in general language as well as specialized terminology, with nuances depending on the domain (consumer packaging, industrial assembly, or hardware).