From Wiktionary, the free dictionary
From בְּ־ (b'-, “in”) + מַהֲלַךְ (mahalákh, “(the) course of”).
בְּמַהֲלַךְ־ • (b'mahalákh-)
- In the course of, during.
- במהלך הלילה ― b'mahalákh-haláyla ― in the course of the night
- במהלך החקירה ― b'mahalákh-hakhakirá ― in the course of the investigation
