A person or thing that bosses around others, or someone known for being a show-off or boaster.
From 'bosh' (nonsense/rubbish) plus the agent suffix '-er,' creating a noun for someone who talks or acts in an exaggerated way.
English's '-er' suffix is so productive that we can add it to almost any word to create an agent noun—'bosher' shows how this works perfectly, turning a quality into a person who embodies it.
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