thinning thinning /ˈθɪnɪŋ/

noun

1. The act of diluting something  ( cutting , thinning )
   the act of diluting something
    The cutting of whiskey with water
   the cutting of whiskey with water
    The thinning of paint with turpentine
   the thinning of paint with turpentine
   

 thin thin /ˈθɪn/

adjective

1. () Of relatively small extent from one surface to the opposite or in cross section  ( thin )
   of relatively small extent from one surface to the opposite or in cross section
    Thin wire
   thin wire
    A thin chiffon blouse
   a thin chiffon blouse
    A thin book
   a thin book
    A thin layer of paint
   a thin layer of paint
   
2. () Lacking excess flesh  ( lean , thin )
   lacking excess flesh
    You can't be too rich or too thin
   you can't be too rich or too thin
    Yon Cassius has a lean and hungry look
   Yon Cassius has a lean and hungry look
   
3. () Very narrow  ( slimline , slender , thin )
   very narrow
    A thin line across the page
   a thin line across the page
   
4. () Not dense  ( thin , sparse )
   not dense
    A thin beard
   a thin beard
    Trees were sparse
   trees were sparse
   
5. () Relatively thin in consistency or low in density; not viscous  ( thin )
   relatively thin in consistency or low in density; not viscous
    Air is thin at high altitudes
   air is thin at high altitudes
    A thin soup
   a thin soup
    Skimmed milk is much thinner than whole milk
   skimmed milk is much thinner than whole milk
    Thin oil
   thin oil
   
6. (of sound) lacking resonance or volume  ( thin )
   (of sound) lacking resonance or volume
    A thin feeble cry
   a thin feeble cry
   
7. Lacking substance or significance  ( flimsy , fragile , slight , tenuous , thin )
   lacking substance or significance
    Slight evidence
   slight evidence
    A tenuous argument
   a tenuous argument
    A thin plot
   a thin plot
    A fragile claim to fame
   a fragile claim to fame
   
8. Lacking spirit or sincere effort  ( thin )
   lacking spirit or sincere effort
    A thin smile
   a thin smile
   

adverb

1. Without viscosity  ( thin , thinly )
   without viscosity
    The blood was flowing thin
   the blood was flowing thin
   

verb

1. () Lose thickness; become thin or thinner  ( thin )
   lose thickness; become thin or thinner
   
2. Take off weight  ( reduce , slenderize , slim , melt off , slim down , thin , lose weight )
   take off weight
     The snow began to melt off under the warm sun.
   The snow began to melt off under the warm sun.
   
3. Lessen the strength or flavor of a solution or mixture  ( cut , reduce , thin , dilute , thin out )
   lessen the strength or flavor of a solution or mixture
    Cut bourbon
   cut bourbon
   
4. Make thin or thinner  ( thin )
   make thin or thinner
    Thin the solution
   Thin the solution