"thinning" in the noun sense
1. cutting, thinning
the act of diluting something
"the cutting of whiskey with water"
"the thinning of paint with turpentine"
"thinning" in the verb sense
1. thin
lose thickness become thin or thinner
2. thin
make thin or thinner
"Thin the solution"
3. dilute, thin, thin out, reduce, cut
lessen the strength or flavor of a solution or mixture
"cut bourbon"
4. reduce, melt off, slim, slenderize, thin, slim down
take off weight
Source: WordNet® (An amazing lexical database of English)
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