A plant that grows along the ground or climbs up surfaces; also someone or something that moves slowly and quietly, often with an unsettling quality.
From 'creep,' Old English 'creopan' meaning to crawl. The '-er' suffix makes it either an agent noun (one who creeps) or describes something that creeps.
The word 'creeper' took on a sinister feeling in modern slang—calling someone a 'creeper' means they're acting suspiciously or making people uncomfortable. This shows how words evolve emotional valence beyond their literal meaning.
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