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leader

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noun [countable] American English pronunciation: leader /ˈlidər/ 
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singularleader
pluralleaders
  1. 1
    someone who is responsible for or in control of a group, organization, country, etc.

    a political/military/religious leader

    leader of:

    the leader of the French delegation

  2. 3
    a person, company, or product that is more successful, popular, or advanced than others in a particular area of activity

    They have emerged as industry leaders.

    leader in:

    He is widely acknowledged to be a world leader in his field.

    See also  market leader

hostile architecture

the design of buildings or public spaces in a way which discourages people from touching, climbing or sitting on them …

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boots on the ground

a situation in which a country's armed forces are physically present in an area of conflict …

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