吐絲自縛 [－丝－缚]

Jyutping tou3 si1 zi6 bok3
Pinyin tǔ sī zì fù

Definitions (CC-CEDICT)
  1. to spin a cocoon around oneself (idiom); enmeshed in a trap of one's own devising
  2. hoist with his own petard