SEDonline
Semitic Etymological Database
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Arabic
mtfft - crachat (spit)
(Dozy I 147)
non-vocalized
Reconstruction
PWS
*tpp
- to spit
(SED I No. 72ᵥ)
Rather a biconsonantal stem with various ways of triconsonantization (*tpp, *twp and *tpˀ), Cf. *twb, *tbb ‘to spit, vomit’ (SED I No. 74ᵥ).