disc▪ [v1] probably belongs to ↗marasaẗ ‘rope’. ClassAr still has the denom. vb. I †marisa ‘to fall from the pulley, get stuck’ (said of a rope), hence the expression †marisat ḥibāluhū ‘his affairs were unsettled’, which is close to the modern meanings, obviously metaphorical, ‘to be in trouble, have to cope with s.th.’. Lane vii 1885 lists as the first meaning of the vb. V ‘to be(come) strongly twisted, and adhering’. The notion of ‘strength, power, energy’ inherent in this definition brings it close to the most likely origin of [v2].
▪ [v2] is probably based on this notion of ‘strength, power, force, energy’, treated under ↗marāsaẗ. In ClassAr, a maris is ‘strong’ man, and from the strength, or vehemence, ‘in labour or exertion’ is derived the idea of being ‘experienced in affairs’, of having ‘laboured, or exerted [o.s.], in the management, or transaction, thereof’ (Lane). From here, the step to the modern meaning ‘to exercise, pursue an office, practice a profession’ is not far.