Green’s Dictionary of Slang

common shore n.

a prostitute.

1604		Dekker Honest Whore Pt 1 II i : Your body, Its like the common shoare, that still receiues All the townes filth.
1622		J. Taylor Whore in Works (1630) II 105: A whore worse then a common Shore, or Iakes. A Succubus, a damned sinke of sinne, A mire, where worse then Swine doe wallow.
1654		Mercurius Fumigosus 21 18–25 Oct. 182: The ravishing Accents robb’d all the Deares in Hide-Park of the Sense of hearing, and made all the Anchovis Trees in James Park forsake their roots, and challenge the stones of Charing-Crosse to Dance a Levalto through all the Common-shoares to Queen-hithe, where they are to be lightened up by Hymens Torches, made of Dears-wax of Audly End-Park.
1678		Villiers ‘Character of an Ugly Woman’ in Misc. Works 26: Her Chamber is the Common-shore of the Town: The long Celler of Amsterdam is not more frequented.
1688		C. Sackville ‘A Faithful Catalogue’ in Lord Poems on Affairs of State (1968) IV 214: From all the corners of our noisome town / The filth of ev’ry brute ran freely down / To that insatiate strumpet’s common shore.
1690		‘United Lovers’ Pepys Ballads (1987) V 415: A Wanton Whore, Nature’s very Common-shore.
1708		N. Ward Adam and Eve 117: Man may commend a Common-Shore, That every Scoundrel uses; But still a Whore will be a Whore, In Spite of all the Muses.
1734		Pope Sober Advice from Horace line 29: Rufa’s at either end a Common-Shoar, / Sweet Moll and Jack are Civet-Cat and Boar.