くする details

high + make it -er — somebody deliberately changes how much of a quality something has

taka ku suru

make it -er — somebody deliberately changes how much of a quality something has

meaning: make it high

時間じかんがないので、話はなしを短みじかくする。

jikan ga nai node, hanashi o mijika ku suru.

There isn't much time, so I'll make it short. neutral

ねえ、テレビの音おと、もうちょっと小ちいさくして。

nee, terebi no oto, mou chotto chiisaku shite.

Hey, turn the telly down a bit, would you. casual

Examples

make it -er — an agent deliberately changes how much of a quality something has

時間じかんがないので、話はなしを短みじかくします。

jikan ga nai node, hanashi o mijikakushimasu.

There isn't much time, so I'll make it short. neutral

ねえ、テレビの音おと、もうちょっと小ちいさくして。

nee, terebi no oto, mou chotto chiisaku shite.

Hey, turn the telly down a bit, would you. casual

部屋へやを明あかるくするために、白しろいカーテンに変かえました。

heya o akaruku suru tame ni, shiroi kaaten ni kaemashita.

I changed to white curtains to brighten the room. neutral

恐おそれ入いりますが、お声こえをもう少すこし大おおきくしていただけますか。

osoreirimasu ga, o koe o mou sukoshi ookiku shite itadakemasu ka.

I'm sorry, but could you speak up a little? formal

A few have hardened into idioms: 早はやくして is "hurry up", not "make it
early", and 安やすくしておきます is a shopkeeper offering a discount.

にする
The class of the quality word decides which one — い-adjectives take くする (高たかくする), nouns and な-adjectives take にする (半分はんぶんにする, 静しずかにする) — though にする is heard first as picking an option off a menu, a reading くする never has.

くなる
One verb apart with responsibility reversed — 短みじかくした says somebody cut it, 短みじかくなった says it ended up shorter with nobody named, so swapping them either accuses or excuses the person holding the scissors.