pledge

IPA: pɫˈɛdʒ

A solemn promise to do something.
(with the) A promise to abstain from drinking alcohol.
An asset or person temporarily handed over to guarantee the fulfilment of something promised, under threat of permanent loss of the thing handed over; surety, security, hostage.
(law) A bailment of personal property to secure payment of a debt without transfer of title.
The personal property so pledged, to be kept until the debt is paid.
(university slang) A person who has taken a pledge of allegiance to a college fraternity, but is not yet formally approved.
A drinking toast.

To make a solemn promise (to do something).
To deposit something as a security; to pawn.
(transitive) To give assurance of friendship by the act of drinking; to drink to one's health.

Examples of "pledge" in Sentences

Before joining the fraternity, all new members must recite the pledge of allegiance to show their dedication
The company made a public pledge to reduce its carbon footprint by 50% within the next five years
As a nurse, I took a pledge to always prioritize the well-being of my patients above all else
When they got married, they exchanged heartfelt pledges of love and commitment
The student council president made a pledge to address the concerns of her fellow classmates and work towards positive change