Psalms 18:45 - Joseph Benson’s Commentary on the Old and New Testaments

The strangers shall fade away Shall wither and decay in their hopes end strength; and be afraid That is, shall come trembling, one verb being put for two; out of their close places Out of their strong holds, where they shall lurk and keep themselves close, for fear of me, not daring to stir out without trembling, lest I should assault and take them. Dr. Waterland renders it, They shall faint away, and come creeping out of their coverts. Grotius's comment is, “They shall suspect their safety in the very places to which they flee for refuge.”