There are numerous synonyms for the phrase "do something for luck." Some common ones include: 1. Perform a superstitious ritual 2. Make a wish 3. Cross your fingers 4. Knock on wood 5. Wear a lucky charm or talisman 6. Pray or recite a mantra 7. Light a candle 8. Toss a coin into a wishing well 9. Blow out all the candles on a birthday cake 10. Follow a specific routine or pattern before undertaking a task No matter which method one chooses to invoke good fortune, it's important to remember that ultimately, success comes from one's own hard work and determination.