(N. Amer.)a lockable container; a safe (北美)带锁的箱子;保险箱 ■a delivery letter box provided with a lock 带锁信箱 ■[mass noun]a service provided by a bank, whereby the bank receives, processes, and deposits all of a company's mail receipts 锁箱服务(由银行提供的一种服务,用以接收、处理并存储公司的邮件)