For Levy and Jastrow on Prov. 18:19, see s.v. ˀḥdh, ˀḥdtˀ n.f. : bar; blockage. Thanks to Eli Phen for pointing out that this interpretation if preferable.
The passage cited by LS2 for "aid" is due to a typographic error in the publication; see s.v. ˀḥd vb.