IPA: /ˈbæɡˌwɜrm/
KK: /bæɡwɜrm/
A type of moth that creates a protective case made of silk and plant materials, often harmful to trees.
The bagworm larvae can damage trees by feeding on their leaves.
The word 'bagworm' is formed from 'bag' (from Old Norse 'baggi', meaning a sack or pouch) and 'worm' (from Old English 'wyrm', meaning serpent or worm). A bagworm is an insect that creates a protective case or bag for itself, resembling a worm.
Think of a 'bag' as a protective pouch and 'worm' as a creature that lives inside it — that's why a bagworm is an insect that lives in a bag.