Collins Concise English Dictionary © HarperCollins Publishers::

chicken out vb
  1. (intr, adverb) informal to fail to do something through fear or lack of conviction

chicken /ˈtʃɪkɪn/ n
  1. a domestic fowl bred for its flesh or eggs, esp a young one
  2. the flesh of such a bird used for food
  3. any of various similar birds, such as a prairie chicken
  4. slang a cowardly person
  5. slang a young inexperienced person
  6. informal any of various, often dangerous, games or challenges in which the object is to make one's opponent lose his nerve
  7. count one's chickens before they are hatchedto be overoptimistic in acting on expectations which are not yet fulfilled
  1. slang easily scared; cowardly; timid
Etymology: Old English ciecen; related to Old Norse kjūklingr gosling, Middle Low German küken chicken

'chicken out' also found in these entries:
In the English description:

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