beckon vs warning sign

beckon

noun
  • A sign made without words; a beck. 

  • A children's game similar to hide and seek in which children who have been "caught" may escape if they see another hider beckon to them. 

verb
  • To seem attractive and inviting 

  • To wave or nod to somebody with the intention to make the person come closer. 

warning sign

noun
  • A sign that indicates a danger, for example to vehicles on a road or of hazardous chemicals. 

  • An indication that someone or something is in danger or at risk 

How often have the words beckon and warning sign occurred in a corpus of books? (source: Google Ngram Viewer )