From Longman Dictionary of Contemporary Englishshade into something phrasal verb literaryMIXif one thing shades into another, it is difficult to know where one stops and another starts His impatience shaded into anger. → shade→ See Verb table
Examples from the Corpus
shade into • At times, self-consciousness can shade into actual fear; for many street remarks are not ambiguous but clearly hostile.• Bedford felt his impatience shading into anger.• He tried at first to register indifference shading into disapproval.• Slowly the wonder faded, shading into puzzlement.• National xenophobia shading into racism is almost universal.• The peacocks are startled out of the shade into the sunlight. 