1A person (especially a woman) resembling a doll in some way; specifically (a) a person of doll-like appearance, or with doll-like features; a particularly attractive person; (b) a helpless, docile, or compliant person, or one who is treated as a plaything.

2US informal. A kind or helpful person; a person who has treated someone else particularly well or has behaved in an especially friendly, thoughtful, or obliging way.