Definition of hoist with or by one's own petard in English:

hoist with (or by) one's own petard

Have one’s plans to cause trouble for others backfire on one.
[from Shakespeare's Hamlet ( iii. iv. 207); hoist is in the sense 'lifted and removed', past participle of dialect hoise (see hoist)]
More example sentences
  • Charges of working against the interests of your own country are very slippery things, and may get the one making the charges hoisted by his own petard someday.
  • But, with any luck, he may soon be hoisted by his own petard.
  • He's been at if for years and he finally got hoisted by his own petard.
See parent entry: petard

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cause (someone) to lose confidence or hope; dispirit