To welcome the new and bid farewell to the old; to see out the old and usher in the new, often referring to personnel changes or the passing of time.
每年这个时候，公司都会举行聚会，大家一起迎新送故，期待未来的发展。
Every year around this time, the company holds a gathering where everyone welcomes the new colleagues and bids farewell to the old, looking forward to future developments.
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