ひとくろう
a hard time; pains
Also written ひと苦労
Noun, Suru verb, Intransitive
山やまの頂上ちょうじょうに近ちかづいたら大おおきな岩いわがゴロゴロあって、そこを乗のり越こえるのに一苦労ひとくろうだったよ。時々ときどきグラグラしている岩いわもあったしね。
I was getting close to the summit, but there were several boulders in my way, and trying to get over them almost did me in. Sometimes there were loose rocks all over the place, too.