Let's say someone promised me something and this person forgot. Is there a single word that means asking this person to deliver this promise? I know that you can "collect" debt, but you cannot "collect" promises, right?
You could say "Are you going to fulfil your promise?"
From Collins Dictionary:
If you fulfil something such as a promise, dream, or hope, you do what you said or hoped you would do.
Example: Politicians will try very hard to fulfil the promises that they make.
One can also
honor (or perhaps
honour) a promise, as in "She asked him to honor his promise." That's not to say there's a single word equivalent for "ask to honor a promise" or even "ask to honor".
Some googly stats:
+"Keep your promise" 1.04m +"Keep his promise" 2.34m +"Honor your promise" 770,000 +"Honor his promise" 632,000 +"Honour your promise" 30,400 +"Honour his promise" 159,000
You could ask them not to renege on their promise.
renege - verb
re·nege | \ ri-ˈneg also -ˈnāg, -ˈnig; rē-
Definition of renege
1 : to go back on a promise or commitment
2 : revoke
3 obsolete : to make a denial
They had promised to pay her tuition but later reneged. my so-called best friend promised to help me move, only to renege come Saturday morning
My so-called best friend promised to help me move, only to renege come Saturday morning
For the person receiving the promise, you can "enforce" the promise. It's more a legal usage than a common usage and it can be a bit slippery because it sounds almost like you will use physical force, but actually it could be anything (like not letting your kid watch TV because they didn't take out the trash like they promised).
From Google: "compel observance of or compliance with (a law, rule, or obligation)"
Here you would compel observance of any obligations regarding the promise.
Legally some promises are "illusory" meaning that the courts won't enforce them, but you could enforce them privately...like the kids not taking out the trash probably wouldn't be enforced by the court system.