Rashi on Numbers 14:45/רש"י על במדבר י״ד:מ״ה

1ויכתום AND COMPLETELY DISCOMFITED THEM — This word is the same in meaning as (Deuteronomy 9:21) “and I pounded it (ואכות) and ground it very thin”. The text implies: blow upon blow.

2ער החרמה EVEN UNTO HORMAH — The place was so called (חרמה doom, destruction) on account of what happened there.