hang your hat on
US /hæŋ jʊər hæt ɑn/
UK /hæŋ jʊər hæt ɑn/
1.
to rely on something or someone as a sure thing; to base one's confidence or hopes on something
:
•
You can really hang your hat on his promises; he always delivers.
•
I wouldn't hang my hat on that prediction; it's too uncertain.