A verb appearing as G. cwir- “to stir, stir round, make spin” in the Gnomish Lexicon of the 1910s (GL/29), clearly a cognate to ᴱQ. qiri- “stir (make spin)” in the contemporaneous Qenya Lexicon and thus derived from a variant of the early root ᴱ√QIŘI [QIÐI] (QL/77).
Neo-Sindarin: A similar root √KWER “revolve” appeared in Tolkien’s later writings (PE17/65), so I think a Neo-Root ᴺ√KWIR “stir, spin” might be used as a variant of that root. As such, I would update this Gnomish word to ᴺS. pir- “to stir, stir round, make spin”, since (unlike in Gnomish of the 1910s) [[at|[kw] became [p]]] in Sindarin of the 1950s and 60s.
pir- "spin, turn" (apparently intransitive). Actually cited in the form piri-, perhaps with the connecting vowel of the aorist included. "Qenya" pa.t. pírë. (QL:74)