To start a task over again because the previous attempt was unsuccessful.

असफल प्रयास के बाद पुनः शुरुआत करना

English Usage: After the prototype failed, we had to go back to the drawing board.

Hindi Usage: प्रोटोटाइप विफल होने के बाद हमें नये सिरे से शुरुआत करनी पड़ी।