To touch or stroke affectionately
To strike lightly
To strike lightly and affectionately
He's let other people pat him.
Dean smiled and gave the old man a pat on the arm.
"Smart boy," Cynthia said to him, giving him a pat on the shoulder.
When Dean didn't introduce himself, Faust gave Jennifer what he meant as an "old boy" pat on her arm and added, "Checking out the property one last time?"
. . she said with a smile as she bent down to pat a frisky parader who'd pulled free of his mistress's leash.