Remaining loyal and supportive in both good times and difficult circumstances.
This phrase dates back to the 14th century and originally referred to traveling through dense forest ('thick') and sparse woodland ('thin'). The metaphor evolved to represent persevering through both difficult and easy situations, with the physical journey becoming a symbol for life's challenges and easier periods.
The beauty of this ancient phrase is how it transforms a medieval traveler's experience into a timeless metaphor for loyalty. Medieval people would have immediately understood the challenge of navigating through varying forest densities - thick undergrowth slowed you down while thin areas allowed faster travel, making it a perfect metaphor for life's ups and downs.
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