Rashi on Genesis 34:21/רש"י על בראשית ל״ד:כ״א

1שלמים means peaceable and whole hearted.

2והארץ הנה רחבת ידים FOR THE LAND, BEHOLD, IT IS LARGE ENOUGH (literally, wide-handed) — the metaphor is that of a man whose hand is large and generous, and the idea is: “You will lose nothing if they dwell and trade in the land, for much merchandise is brought here and there are no buyers for it”.