a. 塞紧的, 拥挤不堪的
在线英汉词典

jam-packed的短语、例句：

jam-packed adj[usu pred 通常作表语] (infml 口) ~ (with sb/sth) very full orcrowded 挤满; 拥挤
a stadium jam-packed with spectators挤满观众的体育馆.