Hebrew

šˁl - (qal, hitp.) to cough (BY 7354)

Attested only in Late Rabbinic Hebrew and considered by Ben Yehuda loans from Syriac [BY 7348]. This can hardly be proved; it is of interest, however, that no verb with a clear meaning ‘to cough’ is known in the whole corpus of Biblical and early post-Biblical texts.

PS
*šˁl - to cough (SED I No. 61ᵥ; Kogan 2011: 231)