Definify.com

Webster 1913 Edition

Verb.

[1st pref.

un-

cap

To remove a cap or cover from.

Verb.

To remove a cap or cover; to open; as, to uncap a vein.

uncap ‎(third-person singular simple present uncaps, present participle uncapping, simple past and past participle uncapped)

remove a cap or cover from