The spelling grownup is also used. The syllable up is not stressed when it is a noun. 亦拼作grownup,用作名词时up不重读。
1 N-COUNT (用作儿语)成年人,大人 A grown-up is an adult; used by or to children. (用作儿语)成年人,大人
SYN adult, man, woman
2 ADJ 成熟的;成年的;长大的 Someone who is grown-up is physically and mentally mature and no longer depends on their parents or another adult. 成熟的;成年的;长大的
3 ADJ-GRADED [usually verb-link ADJ] 似成人的;成熟的 If you say that someone is grown-up, you mean that they behave in an adult way, often when they are in fact still a child. 似成人的;成熟的
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She's very grown-up.
她表现得很像个大人。
4 ADJ-GRADED 适于成人的;成人的 Grown-up things seem suitable for or typical of adults. 适于成人的;成人的 [informal]