一丝不挂

一絲不掛
yīsībùguà
  1. not wearing one thread (idiom); absolutely naked
  2. without a stitch of clothing
  3. in one's birthday suit

CEDICT

to be stark naked

Wiktionary

  1. 赤身裸露。宋．杨万里〈清晓洪泽放闸四绝句〉四首之一：「放闸老兵殊耐冷，一丝不挂下冰滩。」亦泛指无所牵累，不为尘俗所牵累。宋．苏轼〈赠虔州慈云寺鉴老〉诗：「遍界难藏真薄相，一丝不挂且逢场。」也作「寸丝不挂」、「寸丝不挂」。
  2. 钓杆上一条钓丝都不挂。

重編國語辭典

  1. 泛指无所牵累，不为尘俗所牵累
  2. 赤身裸露

維基詞典

Entry Composition

1 一丝 yīsī a tiny bit
2 不 bù
  1. no; not so
  2. (bound form) not; un-
3 挂 guà
  1. to hang; to suspend (from a hook etc)
  2. to hang up (the phone)
  3. (of a line) to be dead
  4. to be worried; to be concerned
  5. (dialect) to make a phone call
  6. to register (at a hospital); to make an appointment (with a doctor)
  7. (slang) to kill; to die; to be finished; to fail (an exam)
  8. classifier for sets or clusters of objects