a.zaq denotes preparing ground around a vineyard by digging about it.

The attested use describes digging about a vineyard plot as part of its preparation before planting.

1. Preparing a vineyard plot by digging about it · dominant

   In Isaiah 5:2, the Piel sequential imperfect form occurs in the account of preparing a plot: the APB renders the clause, "He dug it about," before describing stone-clearing and planting with a vine.

   Isaiah 5:2

In the Anselm Project Bible: In Isaiah 5:2, the APB presents the action as "He dug it about." This rendering is read alongside the verse's broader vineyard-preparation sequence.