Answer: thinning

AnswerCrossword Clue
THINNINGLosing density
thinningHit (a ball) above its center
thinningthe act of thinning
thinningRemove some plants from (a row or area) to allow the others more room to grow
thinningMake or become smaller in width or thickness
thinningMake or become less dense, crowded, or numerous
thinningMake or become weaker or more watery