cap

• n.
  • a tight-fitting headdress
  • a top (as for a bottle)
  • a mechanical or electrical explosive device or a small amount of explosive; can be used to initiate the reaction of a disrupting explosive

    同义词： detonator detonating device

  • something serving as a cover or protection
  • a fruiting structure resembling an umbrella that forms the top of a stalked fleshy fungus such as a mushroom

    同义词： pileus

  • an upper limit on what is allowed

    "they established a cap for prices"

    同义词： ceiling

  • dental appliance consisting of an artificial crown for a tooth

    同义词： crownwork

  • the upper part of a column that supports the entablature

    同义词： capital chapiter

• v.
  • lie at the top of

    "Snow capped the mountains"

    同义词： crest

  • restrict the number or amount of

    "We had to cap the number of people we can accept into our club"

以上来源于: WordNet