ᴱ√TAPA root. “*taper, stretch out”
An unglossed root in the Qenya Lexicon of the 1910s with derivatives like ᴱQ. tapi- “taper, stretch out; feel for, like tentacles” and ᴱQ. tapatenda “taper fingered (light fingered)” (QL/89). In later writings ᴹ√TAP was glossed “stop” (Ety/TAP).
References ✧ QL/89, 93