pir
root. close eyes, blink, wink
pir
root. *cylinder; [ᴱ√] spin; [√]close eyes, blink, wink
pir-
spin, turn
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)
pir-
verb. to stir, stir round, make spin
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!
cwir-
verb. to stir, stir round, make spin
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.
A root introduced by Tolkien in Definitive Linguistic Notes (DLN) from 1959 with the gloss “close eyes, blink, wink” to provide a new explanation for the flower name S. alfirin (originally “immortal = not mortal”) after he decided the prefix al- meant “well” rather than “not” (PE17/146). He derived the names Q. pirindë and S. pirin for “a flower that opened and shut quickly with any change of light”. The root ᴱ√PIRI also appeared (unglossed) in the Qenya Lexicon of the 1910s with derivatives like ᴱQ. piri- “spin, turn”, ᴱQ. pirin “thin rod, pin” and ᴱQ. piruke “swirl, twisting, pirouetting” (QL/74). Finally, the word Q. pirë “toe” appeared in notes associated with the 1955 version of the poem Q. Nieninquë, perhaps representing a third meaning for this root (PE16/96).
Neo-Eldarin: For purposes of Neo-Eldarin, I think the gloss “blink, wink” for √PIR is not a great fit, since it is a contrived etymology Tolkien invented for a word he clearly meant to be something different originally. Q. tihta- is probably a better known verb for “blink”. For “spin”, I prefer a Neo-Eldarin root ᴺ√KWIR adapted from early ᴱ√QIŘI. However, I think ᴺ√PIR might be retained as a Neo-Root with the sense “✱cylinder”; I think this works as an explanation of Q. pirë “toe”, and allows the retention of early words like ᴱQ. pirin “thin rod, pin” and ᴱQ. pirinumbe “cylinder”.