noun | a call to take part in a contest or competition, esp. a duel;
a task or situation that tests someone’s abilities;
an objection or query as to the truth of something, often with an implicit
demand for proof.
Quote | “If you live a life of make-believe, your life isn’t worth anything until you
do something that does challenge your reality. And to me, sailing the open
ocean is a real challenge, because it’s life or death.”
– Morgan Freeman