Keen

(redirected from keen as mustard)
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Keen

(kēn),
William W., U.S. surgeon, 1837-1932. See: Keen operation.
References in periodicals archive ?
"I am keen as mustard to stay at Warwickshire and work with Pop," he said.
So I was dead chuffed knowing it was a great night out, folk would get paid and all and sundry are keen as mustard to support The F Word Tour.
To some he appears cocky and self-assured but to others he's simply keen as mustard. It's run over three nights and worth a look.
Strong said of his revamped squad: "They are keen as mustard, train hard and are full of running, which is great."
4.55 Our Giant Highly regarded type who trainer is keen as mustard to step up in trip.