Also Aramaic / Hebrew צָלַב (ṣāláḇ), Ge'ez ጸለበ (ṣäläbä), but mostly within Arabic a denominal verb of صَلِيب (ṣalīb, “cross”), plausibly also interpreted after the native صَلَّبَ (ṣallaba, “to prop up, to support”).
Practice speaking and memorizing "صلب" and many other words and sentences in Arabic.