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1 with opposite surfaces or sides that are close or relatively close together: thin slices of bread a thin line of paint (of a garment or other knitted or woven item) made of light material: his thin jacket (of a garment or fabric) having become less thick as a result of wear: our clothing was getting thin (of writing or printing) consisting of narrow lines: tall, thin lettering 2 having little, or too little, flesh or fat on the body: a thin, gawky adolescent 3 having few parts or members relative to the area covered or filled; sparse: a depressingly thin crowd his hair was going thin (of the air or a substance in the air) not dense: the thin cold air of the mountains Climbing denoting a route on which the holds are small or scarce. 4 (of a liquid substance) not containing much solid; flowing freely: thin soup
5 lacking substance or quality; weak or inadequate: the evidence is rather thin (of a sound) faint and high-pitched: a thin, reedy little voice (of a smile) weak and forced.
with little thickness or depth: cut the ham as thin as possible [in combination ] : a thin-sliced loaf
1 make or become less dense, crowded, or numerous: [with object ] : the remorseless fire of archers thinned their ranks [no object ] : the trees began to thin out (as adjective thinning) thinning hair [with object ] remove some plants from (a row or area) to allow the others more room to grow: thin out the rows of peas make or become more watery in consistency: [with object ] : if the soup is too thick, add a little water to thin it down [no object ] : the blood thins 2 make or become smaller in thickness: [with object ] : their effect in thinning the ozone layer is probably slowing the global warming trend
3 [with object ] Golf hit (a ball) above its centre.