set (your) heart on (something/doing something)

to decide to achieve something.

She's set her heart on a big wedding.

• promises, promises
• promise the moon
• proof of the pudding
• proof of the pudding .
• proof of the pudding is in the eating
• proof of the pudding is in the eating.
• prophet of doom
• pros and cons
• protest too much
• prove mettle
• prove out
• prove out something
• prove/show mettle
• prove/show your mettle
• prove your mettle
• provide for
• provide for someone
• provide for something
• psych out
• psych out someone
• psych someone up
• psych up
• pub crawl
• public enemy number one
• pull a face