* to promise someone pears on the willow
Idiom used here and there by Everybody can use it
When you promise something that is not possible / to make empty promises.
"Prezydent obiecywał gruszki na wierzbie, byleby tylko wygrać wybory."
"The president promised the pears on the willow to win the elections."
Added January 2021 by anonymous
4 out of 5 Polish speakers have heard this