(nautical) Movement against a current, especially a tidal current.

A process for removing the inflexional, and sometimes derivational, affixes from words.

(by extension) To include a term's inflections as part of a search engine's search.

(climbing) The technique of bridging between two holds with hands and/or feet, applying forces to each in opposing directions in order to brace oneself in position.

present participle and gerund of stem