Third time lucky

Generated image of a boy being lucky on the third try
The idiom third time lucky means that after failing twice, someone hopes the third attempt will succeed.

The saying has been used in English since the 1800s and reflects a long standing belief that the number three can bring good fortune. Because of this, many people repeat something three times and hope the third attempt succeeds.

After two failed attempts to start the engine, he turned the key again and said third time lucky!