This is the 2587th most frequent Japanese word.
干し
"干し" means "dried" or "drying."
Here, 干し is used as a prefix meaning 'dried,' indicating the preservation method for the item 'grapes.'
私は昨日干しぶどうを買いました。
I bought dried grapes yesterday.
干す in this sentence is used as a verb meaning 'to dry,' specifically referring to laundry drying outdoors.
洗濯物は外で干すのが好きです。
I like drying laundry outside.
干し, as in 干し草, means 'dried,' used as a descriptor for 'hay,' specifying its freshness and state.