The phrase is often linked to superstitions or traditional beliefs that certain actions can influence luck. She carries a rabbit's foot for luck when buying lottery tickets.
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Cultural Nuance
Different cultures have unique items or rituals associated with luck; 'for luck' attaches to these customs. In some cultures, people might say 'break a leg' for luck before a theater performance.
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Momentary Ritual
Acts done 'for luck' are often small, quick rituals performed before an important event or action. She touched the plane's exterior for luck before boarding.