Akkadian

baṣāṣu - to trickle (CAD B 134, AHw. 110)

Derived words: biṣṣu 'trickle' (CAD B 268, 269, AHw. 130, 131, 1548); buṣāṣu 'trifles' (CAD B 348, AHw. 883).
Probably related to either Arb. bḍḍ 'to flow by little and little' or Arb. baṣṣa l-māˀu = rašaḥa “to leak, to ooze (of water)” (TA 17 491).

PS
*bṣ̂ṣ̂ - to trickle, to flow (EDA I 420)