To be useful or convenient, especially at a particular time or for a specific purpose.
This phrase emerged in the 19th century, combining 'handy' (meaning convenient or easily accessible, from 'hand') with 'come in' meaning to arrive or become available. The 'hand' connection emphasizes the idea of something being within easy reach when needed.
The phrase beautifully captures the serendipitous nature of usefulness - things 'come in handy' often in ways we didn't anticipate. It's frequently used when people discover unexpected utility in something they kept 'just in case,' validating the very human tendency to hold onto potentially useful items.
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