| 单词 | as keen as mustard/ mustard keen | 
| 释义 | as keen as mustard/ mustard keen phrase [usually verb-link PHRASE]See full dictionary entry for  mustard If you are as keen as mustard or mustard keen, you are very eager or enthusiastic.  [mainly British]  I have a pupil who scored very low in assessments but is keen as mustard.   | 
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