Rashi on Numbers 15:35/רש"י על במדבר ט״ו:ל״ה

1רגום expresses the idea of “doing” something (that is, it is an infinitive or verbal noun); in O. F. faisant; (English = doing). Similarly הלוך allant, “going“, and so, too, זכור “remembering”, שמור “keeping”.