For "stream" : see also s.v. שובלה.
The LJLA form תובל at PsJon 41:5,6, 23, 24 is a scribal "aramaizing" hypercorrection; note the correct form at v. 47; yet another example of the "Kaufman" effect (see e.g. http://www.sbl-site.org/meetings/Congresses_Abstracts.aspx?MeetingId=4).
  
Page refs. in other dictionaries: DJPA: 539b; DJBA: 1115b; Jastrow: 1529; Levy Ch-W: 2:448; Tal Sam: 865b; DJA: 81a; Cook,Qumran: 229;

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Derivatives:

swblh, swbltˀ n.f.   ear of grain ; shibboleth

šwblh, šwbltˀ n.f. #2   current