Idea of mutual love, acceptance, no more striving. Apparently Naomi has seen in Boaz qualities that would provide rest for Ruth. He appeared to be motivated by principle, not expediency. He also can be trusted with the welfare of another. Each partner is submissive to the other in ways that involve self-giving sacrifice.
Love means servanthood.
A raised, level area was used, and the floor was packed down hard so as to provide a durable surface. The grain was the placed in a pile on the floor and a heavy, flat slab of rock was dragged over it by oxen. Evenings used - prob. Naomi creeps to Boaz in the dying light of the fire and uncovers his feet so that he will awaken when his feet become cold. Most go thru life lowering risks.