[and bethink thyself, too, of] the Day on which all [human beings] will in truth hear the final blast - that Day of [their] coming-forth [from death].

The Day when they will hear a (mighty) Blast in (very) truth: that will be the Day of Resurrection.

The day when they will hear the (Awful) Cry in truth. That is the day of coming forth (from the graves).

The day when they hear the cry in truth. That is the day of coming forth.

The Day they will hear the blast [of the Horn] in truth. That is the Day of Emergence [from the graves].