/s/ and posis 'drink' from Arabic baz(baz) 'drink', Sabba 'pour water' via reversal, or shirb 'drink' via reversal and turning /sh & r/ into /s/ (cf. sab(sab), sibaab, masabba(t) 'insult, swear at'; zabzaba(t) 'much talk' via reordering and turning /b/ into /m/)....