つゆ

Etymology 1
First cited to a text from 1809-1813.

. Japanese references do not give any etymology.

One could speculate a connection to, as a liquid of a soup could look like dew. The pitch accent values match, giving support to the etymology. However, this is not backed up by any sources.

Noun

 * 1) broth, soup
 * 1) sauce, dipping sauce
 * 2) juice; sap
 * 1) juice; sap