Synonyms for Thinning:

n.

act (noun)
cutting.

v.

diluting (verb)
reducing, Attenuating, Diluting, cutting.
narrowing (verb)
tightening, slenderizing, slimming, narrowing.

Usage examples for thinning

  1. They could see the surf, through the thinning bush, when he said: " You haven't told me how you happen to be aboard the Sally Sims...." – The Sea Bride by Ben Ames Williams
  2. The mist was thinning now, and through it she saw a sight at which her heart sank, for between her and the mount Bambatse Matabele were pouring towards their camp on the river's edge. – Benita, An African Romance by H. Rider Haggard