Your lack of familiarity with the phrase and misunderstanding your own source does not actually prove anything. Here, I'll give you a head start on doing what

Your lack of familiarity with the phrase and misunderstanding your own source does not actually prove anything. Here, I'll give you a head start on doing what I suggested. https://www.google.com/search?q=%22grow+wary%22 https://www.google.com/search?q=%22grow+wary%22 That sure looks like a phrase used across a wide range of contexts and unconnected fields, too wide to support any notion that it's obscure. There's even a non-English news outlet using it in its English coverage.