¹taʕāwar‑ تَعاوَرَ , ‑taʕāwar‑ (taʕāwur)
1 to alternate, take turns (‑h in s.th.), do by turns, take alternately (s.th.); 2 ↗ʕarā (√ʕRW) – WehrCowan1976
▪ A relation of [v1] to the most prominent notion attached to the root √ʕWR, that of *‘blindness’ (> Ar ‘one-eyedness’ > ‘deficiency, imperfection’, ↗ʔaʕwarᵘ, > ‘weakness > pudenda’ ↗ʕawraẗ) is unlikely. No obvious Sem cognates. Within Ar, closer kinship seems to exist only to the Gt-stem ↗¹ĭʕtawara ‘to befall, affect, come over s.o. alternately, successively’ and the *Š-stem ↗ʔaʕāra ‘to lend, loan s.th. to s.o.’ (< *‘to let own by turn, alternately’). – The basic value seems to be similar to that of the present tL-stem, i.e., ‘to alternate, come in intervals, take turns, do by turns’.
▪ The identity of meaning between [v2] and ↗ʕarā ‘to befall, grip, seize, strike, afflict’ shows that √ʕWR often overlaps with ↗ʕRW.
▪ no obvious cognate in Sem.
▪ BadawiHinds1986 arranges corresponding values (e.g, ʔaʕār, vb. IV, ‘to second, send on secondment’, muʕār ‘out on loan’) s.r. ↗√ʕYR.
►¹ĭʕtawara, vb. VIII, to befall, affect (alternately, successively) (s.o.), come (alternately, successively) (‑h over s.o.): Gt-stem, prob. derived from same base as also ¹taʕāwara, perh. with overlapping/influence from ↗ʕawwara ‘to damage, spoil’ as well as ↗ʕRW (with ʕarā ‘to befall, grip, seize, strike, afflict’, ʕurwaẗ ‘tie, bond’, etc.).
►taʕāwur, n., alternation, variation, fluctuation: vn. VI For other values attached to the root, cf. ↗ʔaʕwarᵘ, ↗ʕawraẗ, EgAr ↗ʕīraẗ, ↗²ʕawwara, ↗ʔaʕāra, ↗²ĭʕtawara, ↗³ĭʕtawara, and ↗ʕuwwār, as well as, for the overall picture, root entry ↗ʕWR (with overlappings also from ↗ʕYR, ↗ʕRW and ↗ʕRY)