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True blue
Meaning
Loyal and unwavering in one's opinions or support for a cause.
Origin
'True blue' is supposed to derive from the blue cloth that was made at Coventry, England in the late middle ages. The town's dyers had a reputation for producing material that didn't fade with washing, i.e. it remained 'fast' or 'true'. The phrase 'as true as Coventry blue' originated then and is still used (in Coventry at least). The town's standing was recorded in 1670 by John Ray in the first edition of A Compleat Collection of English Proverbs:
"Coventry had formerly the reputation for dying of blues; insomuch that true blue became a Proverb to signifie one that was always the same and like himself."
There are other theories as to the origin of 'true blue'. For example, the representation in paintings of the Virgin Mary in blue clothing, the purity of lineage of the Spanish nobility (see also blue blood), or the blue aprons worn by butchers. These derivations are unlikely as they aren't supported by documentary evidence that link them to 'true blue'. The Coventry story also has the added credence of closely matching the 'steadfast, unwavering' meaning of the phrase.
The change from the literal 'fast' coloured cloth to the allusory 'steadfast' loyal supporters came around the time that Ray was writing his book of proverbs. The Covenanters were a group of 17th century Scottish Presbyterians who swore to uphold the National Covenant and oppose the rule of James I of Scotland. They wore blue as their badge and those who unequivocally supported the cause were called 'true blue'. Samuel Butler referred to this denomination in the satirical poem Hudibras, 1663:
For his Religion it was Fit
To match his learning and wit;
'Twas Presbyterian true blue
The Covenanters are no longer active but conservative politics still maintains an association with the phrase. Blue was later adopted as the colour of the Tory Party in England (later called the Conservative Party). Staunch Conservative supporters, those whom Margaret Thatcher would have called 'one of us', are known as 'true blue' Tories.