First and last
Definition 1 of 3
Pro Tip 1/3Emphasizes Uniqueness
Underlines that something will not happen again, stressing its uniqueness. 
After the intense experience, he declared it his first and last skydive.
Pro Tip 2/3Highlights Decision
Indicates a strong personal decision against repeating an action. 
She said it was her first and last blind date.
Pro Tip 3/3Not for Repetition
Often used to express relief or regret about a singular event. 
His first and last attempt at cooking was a disaster.