"Set your heart on something"
This idiom means to strongly desire or be determined to achieve something. It implies a strong commitment and focus on a particular goal.
Here are some examples:
* "She set her heart on becoming a doctor."
* "He's set his heart on winning the championship."
* "I've set my heart on visiting Paris next year."
The idiom suggests a dedication and passion for the desired outcome, making it a powerful expression of ambition and aspiration.