crinkle
verb (used with or without object)
to wrinkle; crimple; ripple.
Used to describe an ongoing action or continuous state that was happening at a specific time in the past.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Colin was looking at Lindsey, whose eyes were crinkling into a smile as Hassan loaned her nine cents so they could keep playing.
From "An Abundance of Katherines" by John Green
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