cos
conjunction UK (also 'cos) uk/kəz/ us/kəz/ (US cuz)
（口语）因为
not standard for because
You can cook dinner tonight cos I did it last night. 今晚该你做饭了，因为昨晚是我做的。
cos
noun mathematics specialized
余弦（cosine的缩写）
written abbreviation for cosine specialized