The residents were barricading the entrance with furniture and wooden planks.

barricading 是动词 barricade 的现在分词形式。barricade 来自法语，本意是"用障碍物阻挡"，指"设置路障或障碍物来阻挡通行"。在句中表示居民们正在进行的阻挡动作。