"snowballing" meaning in English

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          "text": "\"Operating the WCML at this intensity makes it challenging to maintain acceptable performance levels, resulting in a frustratingly unreliable service for passengers. Minor disruption can escalate into significant delays because a train running only a few minutes late can miss its slot across a junction, resulting in a snowballing effect across the network.\"",
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        "present participle and gerund of snowball"
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