A verb appearing as its Noldorin-style infinitive form tammo “to knock” in The Etymologies of the 1930s, derived from primitive ᴹ✶tambā́- under the root ᴹ√TAM “knock” (Ety/TAM; EtyAC/TAM). In The Etymologies as published in The Lost Road Christopher Tolkien gave the infinitive form as tamno (LR/390), but Carl Hostetter and Patrick Wynne corrected this to tammo in their Addenda and Corrigenda to the Etymologies (VT46/17).
Quenya
pet-
verb. knock, strike
órenya quetë nin
my heart tells me
#pet- vb. "knock, strike" (cited as "pete", perhaps with a suffixed stem-vowel); pa.t. pentë given. (QL:73)