is lumbering
Present progressive he/she conjugation of lumber.

lumber

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500+ learners.
When a hurricane is lumbering their way, state officials have time to get extra personnel in place so they can immediately start on cleanup.
Cuando un huracán se insinúa en su dirección, el personal estatal tiene tiempo suficiente como para destacar personal adicional en terreno de tal manera que ellos puedan iniciar labores de limpieza inmediatamente.
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