The story
Likely from an old Bedfordshire proverb "as plain as Dunstable road" or "as plain as Dunstable highway".
Etymology from Wiktionary, CC BY-SA 4.0.
plain Dunstable
Today it means: straightforward language; straight talk. Full definition →
Today it means: straightforward language; straight talk. Full definition →
Likely from an old Bedfordshire proverb "as plain as Dunstable road" or "as plain as Dunstable highway".
Etymology from Wiktionary, CC BY-SA 4.0.