線索

线索
xiànsuǒ
  1. trail
  2. clues
  3. thread (of a story)

CEDICT

Entry Composition

1 線 xiàn
  1. thread
  2. string
  3. wire
  4. line
  5. (after a number) tier (unofficial ranking of a Chinese city)

classifiers: 條, 股, 根
2 索 suǒ
  1. to search
  2. to demand
  3. to ask
  4. to exact
  5. large rope
  6. isolated