Green’s Dictionary of Slang

1. to seduce.

1653

Urquhart (trans.) Gargantua and Pantagruel (1927) I Bk II 363: All the dogs of the country, how they are assembled about a lady [...] and would duffle and line her.

2. (Aus./US) to hit.

1906		E. Dyson Fact’ry ’Ands 151: Jist lined er John with er half-Brunswick, ’n’ got four moon.
2013		F. Bill Donnybrook [ebook] Angus lined him with a jab to the face.

3. (US) to copulate, used of both humans and animals.

1600		Shakespeare As You Like It III ii: Winter’d garments must be lin’d, So must slender Rosalind.
1606		E. Sharpham Fleire I ii: Ladies loue to haue it Linde a good depth in.
1617		Davies of Hereford Wits Bedlam 25: One Master Linder, that was burnt by a Drab and thereof dyed [...] Had he not linde her, Hee had not layne heere.
1681		‘Ladies’ March’ in Wilson Court Satires of the Restoration (1976) 59: [Mall Howard is] lined by duke, lord, knight, and squire, And eke by her confessing friar.
1725		Bailey (trans.)Erasmus’ Colloquies II 160: He would with the utmost diligence look for a dog that was on all accounts of a good breed, to line her, that he might not have a litter of mongrels [F&H].
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: To Line. A term for the act of coition between dog and bitch.
1811		Lex. Balatronicum [as cit. 1785].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1833		Satirist (London) 6 Jan. 429/2: Her Majesty was never fond of open habits. The robe is richly lined [...] but our gracious King, it is said, does not approve of the trimming.
1849		Sam Sly 20 Jan. 3/2: He advises M—a B—h [...] not to go out spunging so often on her friends, when her mother thinks she is gone to get linings for dresses. Query, is it inside lining for herself?
1870		Cythera’s Hymnal 11: He lined her in dining-room, bedroom, or snoring room.
c.1900		‘Ramrod’ Nocturnal Meeting 103: Tottie was lined on by George and twice by his chum.

4. (UK black) to kill.

1933		C. Himes ‘His Last Day’ in Coll. Stories (1990) 296: Trembling like a panicky rat, he upbraided himself. Just like that tyke he had lined that Sunday morning in the Texas Club.
2022		Digga D. ‘Secret’ 🎵 It was us that turned my man to a ghost / Jojo lined Marlow for the bros.

5. (UK black) to conduct a relationship with, to ‘go steady’.

2018-20

T. Thorne (ed.) ‘Drill Slang Glossary’ at Forensic Linguistic Databank 🌐 Line - to go out with (someone), go steady.