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umbilicate
umbilicus
umbo
umbra
umbrage
umbrageous
umbrella
umbrella bird
umbrella liability insurance
umbrella pine
umbrella plant
umbrella stand
umbrella tree
Umbria
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umeboshi
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um

um [ um ]


interjection 
Definition:
 
representing hesitation in speech: a word used in writing to represent the kind of grunting sound that people make when they hesitate in speaking

[Early 17th century. Representing an inarticulate sound]
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