to cause to crack, crack (s.th.); to split, cleave; pass. fuṣima to be destroyed (house) – WehrCowan1979.
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According to Ehret1989:177, the root is an extension in fortative *‑m from a biconsonantal *PṢ ‘to take out’, originally meaning ‘to cut, break’. Other derivations from the same *PṢ : faṣṣ ‘to separate, detach, pull out from’ (↗faṣṣ), (iterative) †faṣfaṣ ‘to separate, disperse’, (iterative) faṣḥ ‘to break forth and shine in full splendor’ (↗faṣaḥa), (durative) faṣd ‘to bleed’ (↗faṣada), (sunderative) †faṣʕ ‘to press the fresh date to make it come out of the shell, so take or scrape off the shell of an almond, put off the turban’, (finitive) faṣl ‘to cut off and separate one thing from another, detach, distinguish between’ (↗faṣala), (inchoative > tr.) faṣy ‘to separate, loosen, dismiss, set free’ (↗tafaṣṣà).
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►ĭnfaṣama, vb. VII, to have a crack, be cracked; to be split, be cleft: pass. of I. ►faṣm, n., pl. fuṣūmāt, recess, niche, chamfer (in walls; arch.): lexicalized vn. I.