That means to increase or round up, or decrease or round down to the nearest nickel.

换句话说，就是提高或降低商品价格以凑到最近的镍币。

For the 1841 census it was decided to round down ages over fifteen to the nearest five.

【round】年的人口普查决定把 15 岁以上的年龄下舍取五的倍数。

You can eventually claim at most half of them, rounded down, since Fate gets at least one for each card you take.

您最终最多可以索取其中的一半，四舍五入， 因为 Fate 会为您拿走的每张牌至少获得一张。