I turned my head sideways and jumped up and down on one leg to try to get the water out of my ear.
ーI turned my head sideways and jumped up and down on one leg to try to get the water out of my ear.
「私は、頭を横にしてケンケンして耳の水を出そうとした」
to turn one's head sideways で「頭を横に向ける」
to jump up and down on one leg で「片足で飛び跳ねる」=「ケンケンする」
to get the water out of one's ear で「耳から水を出す」
ご参考まで!