Definition of pledges:
(v) :
To make a solemn promise (to do something).
(v) :
To deposit something as a security; to pawn.
(v) :
(transitive) To give assurance of friendship by the act of drinking; to drink to one's health.
(n) :
A solemn promise to do something.
(n) :
(with the) A promise to abstain from drinking alcohol.
(n) :
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.