To back down, give up, or otherwise change one's mind to engaging or completing a given task, circumstance, or opportunity, often out of fear or lack of will
Chicken (of a
person) - A
person who has backed down or given up on a task, circumstance, or opportunity,
"I can't do this any longer, I'm going to chicken out!" (To) Chicken Out
Chicken (of a
person) - "We'll see you later then,
chicken."