The crossword solution for the term 'WHAT THE HEN DID' is 'LAID, ' which is a four-letter word. This term is referring to the action of a hen laying eggs. Hens are domesticated birds that are kept as livestock for their eggs, meat, and feathers. They lay eggs on a regular basis, usually one or two a day. The eggs are then collected and used for various purposes such as baking, cooking, and eating.