What is irony?

an unexpected, undesirable event; often physically injurious
having great physical beauty or appeal
having high blood pressure
a curious or humorous unexpected string of events marked by coincedence

Irony is a literary device or rhetorical technique in which there is a discrepancy between what is said and what is meant, or between what is expected to happen and what actually occurs. It involves using words to convey a meaning that is the opposite of the literal meaning. Irony can also involve situations or events that are the opposite of what is expected or intended.

an unexpected, undesirable event; often physically injurious

having great physical beauty or appeal
having high blood pressure
a curious or humorous unexpected string of events marked by coincedence
which one

The third option "having high blood pressure" is not related to the concept of irony. Irony is typically associated with the first, second, and fourth options where there is an unexpected or humorous twist in either words, situations, or events.

pick one

The correct definition for irony is:

a curious or humorous unexpected string of events marked by coincidence.