Cast-off things, especially clothes, are ones which someone no longer uses because they are old or unfashionable, and which they give to someone else or throw away.
例句
Alexandra looked plump and awkward in her cast-off clothing.亞歷山德拉穿著那身過時的衣裳，顯得臃腫笨拙。
英漢詞典釋義
n.
被丟棄的人;廢棄物
The factory has dumpaged its castoff into that river all along.As result,the river has been polluted.該工廠一直將其廢棄物傾倒在那條河里。結果，那條河被污染了。