He has become much thinner.／He has lost a lot of weight.
She is looking for a way to reduce.
She has lost three kilograms in the past two months.
She is on a diet.
a lean [thin] man [dog]
❷〔土地が〕become sterile [impoverished]
This soil is sterile.
「However reduced in circumstances I may be now [Poor as I am now], I was once a star actor.