IPA: /ˈkiːpseɪk/
KK: /ˈkipˌseɪk/
An object that is kept as a reminder of a person, place, or event, often because it has sentimental value.
She kept the locket as a keepsake of her grandmother.
Keepsake is formed from "keep" (from Old English *cepan*, meaning to hold or retain) and "sake" (from Old English *saca*, meaning cause or reason). The word refers to an object kept for the sake of remembering someone or something.
Think of holding onto something ('keep') for a reason ('sake') — that's why a keepsake is a cherished item you hold onto for memories.
No commonly confused words.