Definitions
Century Dictionary and Cyclopedia
- n. A tiny dwarf: sometimes applied in derision to a diminutive person.
Wiktionary
- n. colloquial, dated A very diminutive person.
GNU Webster's 1913
- n. colloq. A very diminutive person.
Examples
“Who do you think would fash themselves about such a little hop-o'-my-thumb?”
“And after vague hop-o'-my-thumb wanderings, he had a disconnected memory of Hugh -- a wild, rugged, ragged, bearded Hugh who caught him up fiercely as though he had an ogrish hunger for the feel of little boys.”
“All his wits are in his eyes, as you can tell jest to look at him – an 'for sech a little hop-o'-my-thumb female that don't reach nigh up to his shoulder.”
“I can't be taking orders off'n every hop-o'-my-thumb like that college kid.”
“It is too much associated with a truckling, subservience to English people and English ideas and the silly swagger of the hop-o'-my-thumb junior officer.”
“All his wits are in his eyes, as you can tell jest to look at him -- an 'for sech a little hop-o'-my-thumb female that don't reach nigh up to his shoulder.”
“There were -- let me see -- two, three, four, actually five girls of varying heights, the two elder, twins apparently, for in all respects they resembled each other so closely; three or four boys, too, from Jack of fourteen to little hop-o'-my-thumb Chris of six.”
“Marry, thou hop-o'-my-thumb, happy wouldst thou be could thy head reach the captive Baron's girdle. '”
“So brisk, and blunt, and eager, quite lifting his niece off her feet, and almost crushing her in his embrace, telling her she was still but a hop-o'-my-thumb, and shaking hands with his nephew with a look of scrutiny that brought the blood to the boy's cheek.”
“At the next station we drank large quantities of hot milk, flavored with butter, sugar and cinnamon, and then pushed on, with another chubby hop-o'-my-thumb as guide and driver.”
Northern Travel Summer and Winter Pictures of Sweden, Denmark and Lapland
Lists
These user-created lists contain the word ‘hop-o'-my-thumb’.
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Hyphen Nation
Terms with multiple hyphens, such as rent-a-crowd. Not intended to be a see-how-many-words-one-can-string-together-with-hyphens-used-adjectively sort of list.
much-talked-of, vis-à-vis, tête-à-tête, rope-a-dope, will-o'-the-wisp, dick-a-tuesday, will-in-the-wisp, jack-o'-lantern, jack-with-a-lantern, ear-to-ear, whack-a-mole, no-man's-land and 205 more...
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My Little Phonies
Names for the next generation of My Little Ponies. Inspired by Star's list.
juggernaught, flamboyant, cuddly maggot, astrobleme, agroof, windburn, poshlost, crucifer, feedbag, dunderwhelp, nebelwerfer, bliss ninny and 453 more...
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Fairy Tales
The Brothers Grimm, Disney, Hans Christian Anderson, Charles Perrault, folklore, George MacDonald, the inhabitants of Fabletown--it's all fair game.
cinderella, rose red, snow white, prince charming, beauty and the beast, sleeping beauty, little red riding..., pinocchio, bigby wolf, big bad wolf, briar rose, bluebeard and 45 more...
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O'-ho
tam-o'-shanter, jack-o'-lantern, man-o'-war, will-o'-the-wisp, light-o'-love, cat-o'-nine-tails, hop-o'-my-thumb, tom o' bedlam, bess o' bedlam, john o' groats, five o'clock shadow, o'dark thirty and 25 more...
Tweets
Looking for tweets for hop-o'-my-thumb.

chained_bear Usage note on hop-o-my-thumb (which is the less common spelling, I think). Sep 5, 2008