Thus saith the Lord GOD; In the day when he went down to the grave I caused a mourning: I covered the deep for him, and I restrained the floods thereof, and the great waters were stayed: and I caused Lebanon to mourn for him, and all the trees of the field fainted for him.
I covered the deep for him - as mourners cover their heads in token of mourning. 'I made the deep that watered the cedar to wrap itself in mourning for him.' The waters of "the deep" are the tributary peoples of Assyria (Revelation 17:15, "The waters which thou sawest, where the whore sitteth, are peoples, and multitudes, and nations, and tongues").
All the trees of the field fainted for him - literally, were faintness (itself); more forcible than the verb.