capper

From Middle English capper; equivalent to cap +‎ -er.

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capper (plural cappers)

1. One that caps.
2. A device or person that applies caps, as to bullets or bottles.
3. A person that makes or sells caps.
4. A finale.
   • 2009, February 1, “Joe Queenan”, in Super Bowl Suits‎:

     The real capper is when St. John starts fawning over Hugh Hefner, host of the finest Super Bowl party known to man, musing: “The question isn’t whether Hef is the hippest octogenarian on the planet.

5. (US, slang, dated) A by-bidder; a decoy for gamblers.

• milliner

• precap

• cappere, capyare, kapiare, capere, capier

From cappe +‎ -er.

• IPA^(key): /ˈkapər(ə)/

capper (plural cappers)

1. capper (maker of caps or other headgear)

• English: capper

• “capper (n.)” in MED Online, Ann Arbor, Mich.: University of Michigan, 2007, retrieved 2018-07-18.