an area of hard material covering part of a wall, for example in a kitchen, so that the wall is protected and easy to clean if liquid falls onto it

Stainless steel is an increasingly fashionable, hard-wearing and beautiful material for worktops, splashbacks and appliances. 不锈钢是一种越来越时尚、耐磨、美观的材料，适用于工作台面、挡板和电器。

the action of liquid splashing (= moving and falling) backwards or onto a surface that is near it

I don't want splashback from dirty plates in my coffee, thanks. 我可不想脏盘子的水溅到我的咖啡里，谢谢。