concern vs gotcha

concern

noun
  • A worry; a sense that something may be wrong; an identification of a possible problem. 

  • The placement of interest or worry on a subject. 

  • The expression of solicitude, anxiety, or compassion toward a thing or person. 

  • That which affects one’s welfare or happiness. A matter of interest to someone. 

  • A business, firm or enterprise; a company. 

  • Any set of information that affects the code of a computer program. 

verb
  • To engage by feeling or sentiment; to interest. 

  • To relate or belong to; to have reference to or connection with; to affect the interest of; to be of importance to. 

  • To make somebody worried. 

gotcha

noun
  • A potential problem or source of trouble. 

  • A feature of a system or a program that works in the way it is documented but is counter-intuitive and almost invites mistake or non-function. 

  • An attempt to disprove or refute someone's argument, usually in a deceptive or disingenuous way. 

  • An instance of publicly tricking someone or exposing them to ridicule, especially by means of an elaborate deception. 

  • An instance of accomplishing a tricky idea or overcoming a difficult obstacle. 

abbrev
  • Understand you; comprehend you. 

  • Got you covered, got your back; when you have an advantage or responsibility over someone. 

  • Got you; have you; as in capture or apprehend. 

  • Got you back; as in after causing some form of retaliation or revenge against someone. 

  • Got you by surprise; exclamation indicating a successful trick or prank. 

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