a.tsam describes closing the eyes, whether imposed in deep sleep or practiced to avoid seeing evil.

The attested use describes closing the eyes: Isaiah 29:10 presents it in the LORD's act upon prophets, while Isaiah 33:15 presents it as a righteous person's refusal to look on evil.

1. Closing eyes in sleep or moral refusal · dominant

   In Isaiah 29:10, the Piel sequential imperfect occurs in the clause about the LORD pouring out deep sleep and closing the eyes of the prophets; the APB renders this, "he has shut your eyes—the prophets." In Isaiah 33:15, the Qal active participle belongs to the description of one who turns from wrongdoing; the APB renders the clause, "who shuts his eyes against seeing evil."

   Isaiah 29:10Isaiah 33:15

In the Anselm Project Bible: The APB presents the action as "shut your eyes" in Isaiah 29:10 and "shuts his eyes against seeing evil" in Isaiah 33:15. These phrases render the verse clauses.