Their groves - Render their idols of wood: and see the Deuteronomy 7:5 note.
Related Commentaries of Deuteronomy 12:3
Deuteronomy 12:3
3 And ye shall overthrowb their altars, and break their pillars, and burn their groves with fire; and ye shall hew down the graven images of their gods, and destroy the names of them out of that place.