русло

Borrowed from Russian ру́сло (rúslo). Morphologically equivalent to ру́ша (rúša, “to trample”) (dialectal) +‎ -сло (-slo).

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ру́сло • (rúslo) n

1. channel, duct, trough

   Synonym: кори́то (koríto)

   ре́чно ру́сло ― réčno rúslo ― riverbed

2. (by extension) course of flow

• ру́ша (rúša, “to trample”) (dialectal), руша́ (rušá, “to wear away, to destroy”)
• ру́ха (rúha, “deformation, failure, fault”) (dialectal)
  • пору́ха (porúha, “wrack, damage”) (dialectal)
  • разру́ха (razrúha, “destruction, ruining”)

• “русло”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “русло”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010

Presumably related to Lithuanian rusė́ti (“to flow”), rusnóti (“to flow slowly”). Compare the name of the Lithuanian river Raũsvė, and Rusnìs, a right distributary of the Neman.

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ру́сло • (rúslo) n inan (genitive ру́сла, nominative plural ру́сла, genitive plural ру́сел or русл)

1. riverbed
2. (figuratively) direction, way, manner, path, vein, course (of development of a situation)

   в конструкти́вном ру́сле ― v konstruktívnom rúsle ― in a constructive way/direction/manner

3. (anatomy) blood vessel

   Synonym: кровено́сный сосу́д (krovenósnyj sosúd)

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русло́ • (rusló) n inan (genitive русла́, nominative plural ру́сла, genitive plural ру́сел)

1. riverbed

• Bilodid, I. K., editor (1970–1980), “русло”, in Словник української мови: в 11 т. [Dictionary of the Ukrainian Language: in 11 vols] (in Ukrainian), Kyiv: Naukova Dumka