Process of removing plants or parts of plants to facilitate the growth of other plants
"The gardener spent Saturday thinning the carrot patch by pulling out excess seedlings so the remaining ones could grow larger."
present participle of thin
"As the winter snow began to melt, the thick blanket covering the forest floor started thinning and revealing patches of brown earth beneath."
Becoming less thick, dense, or numerous
"The crowd began thinning as most of them left for dinner after the concert ended."