Meaning: black mustard 
n.
widespread Eurasian annual plant cultivated for its pungent seeds; a principal source of table mustard
be as keen as mustard Idiom, Proverb
cut the mustard
Keen as mustard
(UK) If someone is very enthusiastic, they are as keen as mustard.Put some mustard on it!
(USA) I think its used to encourage someone to throw a ball like a baseball hard or fast.Can't Cut The Mustard
Someone who isn't adequate enough to compete or participate.cut the mustard|cut|mustard
v. phr., slang To do well enough in what needs to be done; to succeed. His older brothers and sisters helped Max through high school, but he couldn't cut the mustard in college.mustard
mustardsee cut the mustard.
be as agog as mustard
To be actual agog about something. Primarily heard in UK, Australia. These new kids are as agog as alacrity to be in the choir, so we can absolutely get them to apple-pie up the choir allowance for us.Learn more: keen, mustard
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More Idioms/Phrases
muscle museum piece music music to one's ears musical chairs, play must mustard muster muster in mute mutual admiration society my God my heart bleeds for you my name is mud be as bald as a coot be as bright as a button be as brown as a berry be as clear as crystal be as clear as day be as clear as mud be as cute as a button be as daft as a brush be as dead as a dodo be as deaf as a post be as dry as a bone be as dull as dishwater be as fit as a fiddle be as full as a boot be as gentle as a lamb be as good as (one's) word be as good as dead be as good as gold be as good as gone be as good as new be as good as your word be as happy as a sandboy be as happy as Larry be as high as a kite be as honest as the day is long be as keen as mustard be as light as a feather be as mad as a hornet be as mad as a March hare be as nice as pie be as nothing (compared) to (someone or something) be as nothing to be as old as Methuselah be as plain as the nose on (one's) face be as poor as church mice be as regular as clockwork be as safe as houses be as scarce as hen's teeth be as sharp as a tack be as slippery as an eel be as sound as a bell be as stiff as a ramrod be as straight as a die be as well be as white as a sheet be as/like oil and water be asking for trouble be asleep at the switch be asleep at the wheel be at be at (one) hammer and tongs
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Dictionary of similar words, Different wording, Synonyms, Idioms for Idiom, Proverb be as keen as mustard
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