To set your heart on something is to want that one thing above all others. Set your heart on a place at that school.
To set your heart on something makes any alternative feel like a loss, which is the risk in it. Children set your heart on things faster than adults and recover faster too.
1phraseset your heart onTo want one particular thing above all others.
“She had set your heart on the cottage before the survey came back.”
set your heart on is a phrase.
Practised in Idioms