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In some senses, knocker-upper is marked as informal, humorous. Watch for register when choosing this word.
knocker-upper
noun 3
Definitions
noun
1
Alternative form of knocker-up (person who knocks to awaken in the morning).
2
.
3
The male who has sired a pregnancy.
What, Shelley is pregnant?! Who's the knocker-upper? [ = Who's the father?]
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