Very excited and enthusiastic.
Awaiting eagerly.
Little kids are always as keen as mustard to learn new things around them.
She is as keen as mustard to get her hands on the new toys that her mother promised her.
The class was as keen as mustard to begin the 4 day trip.
She went to Europe for a vacation and came home as keen as mustard to go back.
I am as keen as mustard to live rest of my life in Surrey, Canada.
Why you are as keen as mustard to open my parcel? It’s something secret I am not going to show you.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.