adj.
Function: verb
Inflected Form: thinned ; thin · ning
Date: before 12th century
transitive verb : to make thin or thinner: a : to reduce in thickness or depth : ATTENUATE b : to make less dense or viscous c : DILUTE , WEAKEN d : to cause to lose flesh < thinned by weeks of privation> e : to reduce in number or bulk
intransitive verb
1 : to become thin or thinner
2 : to become weak