solemnpledge
nounUK /ˈsɒləm plɛdʒ/
US /ˈsɑːləm plɛdʒ/
A very serious promise that you really mean to keep.
The new club members made a solemnpledge to always help each other.
OTHER MEANINGS
2. A formal and serious commitment made in front of others.
The soldiers gave a solemnpledge to protect their country.
3. A strong promise to do something important, often with a sense of duty.
She made a solemnpledge to finish her school project on time.
4. A serious agreement that someone will keep their word no matter what.
The two friends made a solemnpledge to stay best friends forever.