Despite his hard work, his plans _____ .

• Despite his hard work, his plans ended in smoke.
- কঠোর পরিশ্রম সত্ত্বেও, তার পরিকল্পনা বিফলে গেল।

• End in smoke
- English Meaning: to come to nothing, to fail, or to produce no positive result; have no significant or successful result in the end.
- Bangla Meaning: ব্যর্থ হওয়া।

• Ex. Sentences:
- After all the planning, the trip ended in smoke.
- The negotiations ended in smoke, and the deal fell through.

Source:
1. Oxford Dictionary.
2. Website Lecture.