Her eyes 'strayed from' her computer to the window. [=she stopped looking at her computer and began looking at/out the window]
a 'straying' husband [=a husband who has sexual relations with a woman who is not his wife]
I matched up the socks in the laundry but I was left with one 'stray'. [=one extra sock]
(..) Sandor! Cervenko was killed. He was patroling to identify that damn pojector of the other side. I'm sorry, Bologa. Such an absurdity. A stray bullet... He lived half an hour after that. He was crying and kept repeating: "The love, the love, only the love." I brought him from the wires. (..)1965 Forest of the Hanged