1N-MASS 芥子酱;芥子泥Mustard is a yellow or brown paste usually eaten with meat. It tastes hot and spicy. 芥子酱;芥子泥
...a pot of mustard.
一罐芥子酱
Thinly paint the lamb with Dijon mustard.
在羊肉上刷上薄薄一层第戎产的芥子酱。
2N-UNCOUNT (果实可做芥子泥的)芥菜花;芥菜Mustard is a small plant with yellow flowers. The seeds can be used to make mustard. (果实可做芥子泥的)芥菜花;芥菜
3COLOUR 芥末色;暗黄色Mustard is used to describe things that are brownish yellow in colour. 芥末色;暗黄色
...a mustard coloured jumper.
暗黄色的羊毛衫
4PHRASE [usu with neg]如所期待的那么好;符合要求 If someone does not cut the mustard, their work or their performance is not as good as it should be or as good as it is expected to be. 如所期待的那么好;符合要求 [informal]
5PHRASE [usually verb-link PHRASE]非常渴望;非常热情 If you are as keen as mustard or mustard keen, you are very eager or enthusiastic. 非常渴望;非常热情 [mainly British]
I have a pupil who scored very low in assessments but is keen as mustard.