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Children's Dictionary
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untie to free from being tied or bound. [3 definitions]
until up to the time when. [5 definitions]
untrue not correct or accurate; false. [2 definitions]
unusual not usual or ordinary; not common; remarkable.
unwell in poor health; sick; ill.
unwind to undo from a wound or twisted state; remove the twists from. [4 definitions]
up to, toward, at, or in a higher place or position. [23 definitions]
up- a prefix that means "up" or "upward."
upbringing the training and rearing of a child or children.
update new and more recent information about a particular thing, or a change in something that is made with the aim of improving it. [3 definitions]
up for grabs (informal) able to be taken by anyone; not yet decided.
upgrade an upward slope or incline. [2 definitions]
upheaval an act, instance, or condition of being raised or heaved upward. [2 definitions]
uphill on an upward slope or in an upward direction. [3 definitions]
uphold to support or decide in favor of, when faced with a challenge. [2 definitions]
upholstery materials used to cover furniture. [2 definitions]
up in the air not decided, not settled, or not certain.
upland the raised or higher parts of land in a region. [2 definitions]
upload to send information from a smaller computer to a larger computer or computer network. [2 definitions]
upon on. [3 definitions]
up one's sleeve held secretly or in reserve.