Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Gnomish

dod-

verb. to fall down, drop

A verb appearing as G. dod- “fall down, drop” in the Gnomish Lexicon of the 1910s (GL/30), clearly based on the early root ᴱ√ÐOTO “drop, fall” (QL/86).

Neo-Sindarin: There is a later verb danna- “fall”, but no later verb for “drop”, so I would retain ᴺS. dod- “to drop” for purposes of Neo-Sindarin, based on a Neo-Root ᴺ√DOT of the same meaning.