Gnomish
dont
noun. fall, bump, drop
dod-
verb. to fall down, drop
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!
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.