get in sb.'s hair

1. 惹烦某人
   The children kept getting in my hair.

   孩子们不停地惹恼我。

harm a hair of sb.'s head

1. 损某人一根毫毛
   If you harm a hair of my daughter's head, you'll get yourself into trouble.

   你要是损我女儿一根毫毛，你可就自找麻烦了。

let one's hair down

1. 不拘礼节
   It's wonderful to let your hair down at the weekend after you've been working hard all week.

   辛苦工作一周后在周末不拘礼节轻松一下真是太好了。

make sb.'s hair stand on end

1. 令某人毛骨悚然
   It would make your hair stand on end.

   那会使你毛骨悚然的。

not turn a hair

1. 不动声色
   Susan just stood and didn't turn a hair.

   苏珊站着不动声色。

split hairs

1. 作极细微的分析
   Scholars nowadays just split hairs; they never address the basics.

   当今的学者只作不必要的细微区分；他们从来不谈根本。

   David loves to split hairs.

   戴维就爱作一些琐细的分析。

• hair of the dog
  informal an alcoholic drink taken to cure a hangover. [from hair of the dog that bit you, formerly recommended as an effective remedy for the bite of a mad dog.]
• a hair's breadth
  a very small margin.
• in (or out of) someone's hair
  informal annoying (or ceasing to annoy) someone.
• keep your hair on!
  Brit. informal stay calm.
• let one's hair down
  informal behave uninhibitedly.
• make someone's hair stand on end
  alarm someone.
• not turn a hair
  remain apparently unmoved.
• split hairs
  make overfine distinctions.