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!

Qenya 

tamba-

verb. to knock, keep on knocking

A verb in The Etymologies of the 1930s glossed “to knock, keep on knocking” under the root ᴹ√TAM “knock” (Ety/TAM). See the entry ᴹQ. ton- for other similar “knock, tap” verbs.