sa.gad describes bowing down before an object made or treated as a god.

Across the supplied verses, the verb denotes bowing down in acts directed toward a made god, idol, or block of wood; the same use appears with singular and plural subjects.

1. Bowing down before a made god or object · dominant

   In Isaiah 44:15 and Isaiah 44:17, a man makes a god or idol from material and then directs this action toward it; the APB renders the surrounding clauses with "bows down" and "prostrates himself." Isaiah 44:19 frames the same action as bowing down to a block of wood, while Isaiah 46:6 has a plural subject after making someone into a god; the APB renders the clause "they prostrate themselves and also bow."

   Isaiah 44:15Isaiah 44:17Isaiah 44:19Isaiah 46:6

In the Anselm Project Bible: The APB presents the action with "bows down," "prostrates himself," and, for the plural subject, "they prostrate themselves and also bow." These renderings describe the clauses rather than fixing a separate English equivalent for each form.