Green’s Dictionary of Slang

Woolworth n.

In compounds

Woolworth marriage (n.) (also Woolworth wedding) [an era when hoteliers looked askance if a couple had no visible proof of their wedded status]

a ‘marriage’ that exists only in the cheap Woolworths’ ring purchased for the occasion.

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[UK]Partridge DSUE (8th edn) 1350/2: [...] since ca. 1925.