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Verb: thin out
  1. Make sparse
    "thin out the young plants"
  2. Become sparser
    "Towards the end of town, the houses thinned out"
  3. Lessen the strength or flavour of a solution or mixture
    - dilute, thin, reduce, cut

Derived forms: thinned out, thinning out, thins out

Type of: bring down, cut, cut back, cut down, decrease, diminish, fall, lessen, reduce, trim, trim back, trim down, weaken