Third-person singular simple present indicative form of uncap.(verb)
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Use "uncaps" in a sentence
"She chews on the end of her pen and uncaps it to cross out a line."
"When, toward the end of the story, Mrs. Webster tells him that she and her husband have decided to leave the area, she inadvertently uncaps a geyser of schmaltz:"
"Instapaper Free is a free download for iPhones and iPod touch models running the 2.0 upgrade; the “Pro” version uncaps the 10-article limit."