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The phrase 'grin on' is not correct in written English.
You could use the phrase 'grin on [someone]' to describe a person smiling at someone else, but it would not be considered standard written English. For example, "The clown grinned on the children in the audience."
Exact(57)
"He had this big grin on his face," Idle recalled.
But one could imagine a sly grin on his face.
There's a little grin on his face.
Now Marcus had his big grin on.
You just get this grin on your face.
He had a big grin on his face.
He turned to me with a grin on his face.
He has this funny grin on his face.
But I have a huge, ridiculous grin on my face.
He's got a huge grin on his face.
Similar(1)
I wanted the half-grin on my husband's face when I re-entered the bar.
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