IPA: /ˈplaɪtər/
KK: /ˈplaɪtər/
A person or thing that makes a promise or pledge, often in a formal or serious manner.
The plighter of the agreement ensured that all parties understood their commitments.
Plighter → The word 'plighter' comes from the verb 'to plight' (from Old English 'plihtan', meaning to pledge or promise) combined with the suffix '-er' (meaning a person who). A plighter is therefore a person who makes a pledge or promise.
Think of someone who is making a 'pledge' ('plight') — the '-er' indicates that this person is the one making the promise.