cinch vs lock

cinch

verb
  • To tighten down. 

  • To bring to certain conclusion. 

  • In the game of cinch, to protect (a trick) by playing a higher trump than the five. 

noun
  • Something that is very easy to do. 

  • A firm hold. 

  • A variety of auction pitch in which a draw to improve the hand is added, and the five of trumps (called "right Pedro") and the five of the same colour (called "left Pedro", and ranking between the five and the four of trumps) are each worth five. Fifty-one points make a game. 

  • A simple saddle girth used in Mexico. 

  • Something that is obvious or certain to occur; a sure thing. 

lock

verb
  • To become fastened in place. 

  • To raise or lower (a boat) in a lock. 

  • To modify (a thread) so that users cannot make new posts in it. 

  • To freeze one's body or a part thereof in place. 

  • To fasten with a lock. 

  • To be capable of becoming fastened in place. 

  • To seize (e.g. the sword arm of an antagonist) by turning one's left arm around it, to disarm them. 

  • To play in the position of lock. 

  • To intertwine or dovetail. 

  • To prevent a page from being edited by other users. 

  • To furnish (a canal) with locks. 

noun
  • A device for keeping a wheel from turning. 

  • A segment of a canal or other waterway enclosed by gates, used for raising and lowering boats between levels. 

  • Complete control over a situation. 

  • The firing mechanism. 

  • Something sure to be a success. 

  • A fastening together or interlacing; a closing of one thing upon another; a state of being fixed or immovable. 

  • A place impossible to get out of, as by a lock. 

  • A grapple in wrestling. 

  • A tuft or length of hair, wool, etc. 

  • A small quantity of straw etc. 

  • A quantity of meal, the perquisite of a mill-servant. 

  • A player in the scrum behind the front row, usually the tallest members of the team. 

  • A mutex or other token restricting access to a resource. 

  • Something used for fastening, which can only be opened with a key or combination. 

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