verb (used with object), uncapped, uncapping.
to remove a cap or cover from (a bottle, container, etc.).
to free from limits or restrictions: The union is demanding that cost-of-living allowances be uncapped.
to remove a cap or hat from (the head of a person).
verb (used without object), uncapped, uncapping.
to remove the cap or hat from the head, as in respect.

1560–70; un-2 + cap1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
uncap (ʌnˈkæp)
vb , -caps, -capping, -capped
1.  (tr) to remove a cap or top from (a container): to uncap a bottle
2.  to remove a cap from (the head)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Uncap the ends of the sampler immediately before sampling.
Uncap the sample bottle and dispense the appropriate chemical treatment into
  the sample.
Uncap the bottle and take the temperature of the water.
If using the capped version, simply uncap during the sampling period and recap
  at the end of the sampling period.
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