to lose one's health and vigor, physically and/or mentally, due to grief or an intense yearning for something that cannot be attained;
e.g. I expect that he will pine for me for days after I have gone.
(noun)
any of the trees belonging to the family of trees characterized by their elongated needles (instead of leaves) that remain green throughout the year, cone-bearing capacity, and valuable wood, or the durable wood obtained from such trees;
e.g. There was a gigantic pine at the corner of the garden. This table is made from light-colored pine wood.