The word 'swamp' entered English in the early 17th century, likely borrowed from a Low German source such as 'swamp' or the Dutch 'zwamp', meaning a sponge, marsh, or bog. These Germanic terms are thought to be related to a group of words implying a spongy or damp quality, possibly connecting to the Proto-Indo-European root swombho-, meaning 'spongy' or 'porous'. The journey from a concept of spongy texture to its modern meaning as a waterlogged landscape is direct and logical. The verb sense, meaning to overwhelm as if by flooding, developed naturally in the 18th century from the noun's association with being engulfed by water and mud.

This word is a simplex form. It is a loanword into English from a Germanic source, with no further meaningful segmentation possible in its modern English spelling.