You can make 509 anagrams from letters in open-mouthed (-deehmnooptu).
First recorded in 1525-35
Frau Matilda now gazed at me with open-mouthed astonishment.
His amazement now was so open-mouthed as well as open-eyed that she could not help smiling.
And off he stumped, leaving Cyrus staring after him, open-mouthed.
Mrs. Tripp turned to Mr. Bangs; he also was staring, open-mouthed.
I thought he must be crazed by over-study, and I could only sit and stare at him, open-mouthed.
He, staring at her open-mouthed, replied that he was going nowhere.
He stared, open-mouthed, after his nephew and niece, and then turned slowly to his friend.
Two fat ladies, open-mouthed, were yawning with satisfaction.
Primmie, who had also come in from the kitchen, was listening, open-mouthed.
Lute Rogers was staring in at me, open-mouthed and horror-stricken.
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