The psalmist prays, "Let the wicked be disappointed. Let them be silent in Sheol" (31:17). How do I read that?

First, what the verse says. The psalmist prays for himself: "Let me not be disappointed, LORD, for I have called on you" (31:17). Then, with the same Hebrew verb, bosh, he prays against the wicked: "Let the wicked be disappointed. Let them be silent in Sheol" (31:17) (tap disappointed). The next verse names what they do: "Let the lying lips be mute, which speak against the righteous insolently, with pride and contempt" (31:18). The prayer is spoken to the LORD, and the psalmist doesn't say he will act against them himself. Later the psalm says of the LORD, "The LORD preserves the faithful, and fully recompenses him who behaves arrogantly" (31:23). Psalm 31 is not the only psalm that prays against enemies, and Christians read these prayers in more than one way. The chapter on Psalm 109 sets out the main readings, each resting on its verses, and chooses none. These notes don't choose either.