for a/some reason/reasons best known to himself herself etc.
释义
●for a/some reason/reasons best known to himˈself, herˈself, etc. (humorous) for a reason or reasons which other people find hard to understand出于只有自己才清楚的理由◆For reasons best known to himself, he wears two pairs of socks. 谁都猜不透他为什么要穿两双袜子。