pop-up vs sign

pop-up

noun
  • A folded paper element which pops up from a book, greeting card, etc. 

  • A pop-up ball: a ball that has been hit to a considerable height above the infield or the shallow outfield; a pop fly. 

  • A business that quickly pops up, such as a temporary restaurant. 

  • A pop-up advertisement; an advertisement that is triggered to appear on a computer screen when an Internet user accesses a particular web page. 

adj
  • Opening out to form a three-dimensional structure when the page of a book is opened. 

  • Coming into view suddenly from a concealed position. 

  • Employing the cold launch technique. 

  • Operating or existing for a brief period only; temporary. 

sign

noun
  • A clearly visible object, generally flat, bearing a short message in words or pictures. 

  • An astrological sign. 

  • A specific gesture or motion used to communicate by those with speaking or hearing difficulties; now specifically, a linguistic unit in sign language equivalent to word in spoken languages. 

  • Sign language in general. 

  • A wonder; miracle; prodigy. 

  • A perceptible (e.g. visible) indication. 

  • A property of the body that indicates a disease and, unlike a symptom, can be detected objectively by someone other than the patient. 

  • A military emblem carried on a banner or standard. 

  • Physical evidence left by an animal. 

  • A semantic unit, something that conveys meaning or information (e.g. a word of written language); (linguistics, semiotics) a unit consisting of a signifier and a signified concept. (See sign (semiotics).) 

  • An omen. 

  • Positive or negative polarity, as denoted by the + or - sign. 

verb
  • To write (one's name) as a signature. 

  • To validate or ratify (a document) by writing one's signature on it. 

  • To communicate using gestures to (someone). 

  • To bless (someone or something) with the sign of the cross; to mark with the sign of the cross. 

  • To engage (a sports player, musician etc.) in a contract. 

  • To determine the sign of 

  • To cross oneself. 

  • To furnish (a road etc.) with signs. 

  • More generally, to write one's signature on (something) as a means of identification etc. 

  • To write one's signature. 

  • To finalise a contractual agreement to work for a given sports team, record label etc. 

  • To use sign language. 

  • To communicate or make known (a meaning, intention, etc.) by a sign. 

  • To calculate or derive whether a quantity has a positive or negative sign. 

  • To mark, to put or leave a mark on. 

  • To communicate using a gesture or signal. 

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