Official Aramaic

dbr - word, matter (DNWSI 239; HALOT 1848)

only in the fixed expression ˁl dbr ‘concerning, with regard to’, “from Canaanite formal language, as used in bureocracy” (HALOT 1848)

PC
*dbr - to speak (BDB 180, HALOT 210, DRS 214‒215, Schmidt 1978: 94‒95, Kogan 2015: 288)
Arb dabbara - ‘to consider, forecast the results of the affair’ is hardly directly connected