thin out

verbs

make sparse
"thin out the young plants"
thin out
is a type of (narrower)
cut down on; make a reduction in
"reduce your daily fat intake"; "The employer wants to cut back health benefits"
bring down, cut, cut back, cut down, reduce, trim, trim back, trim down
become sparser
"Towards the end of town, the houses thinned out"
thin out
is a type of (narrower)
decrease in size, extent, or range
"The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fell to under a hundred pounds"; "his voice fell to a whisper"
decrease, diminish, fall, lessen
lessen the strength or flavor of a solution or mixture
"cut bourbon"
cut, dilute, reduce, thin, thin out