n an accumulation of jobs not done or materials not processed that are yet to be dealt with (especially unfilled customer orders for products or services)
n the large log at the back of a hearth fire
n something kept back or saved for future use or a special purpose
v accumulate and create a backlog
n. 积压未办之事( backlog的名词复数 ); 没交付的订货; 备用; 备用物
v. （使）积压( backlog的第三人称单数 ); 储存; <商>（为日后装运而）登账确认（订货）