The word "溯溪" is formed by combining the character "溯", which means to go against the current or trace back and is composed of the water radical (氵) with the phonetic component "朔", and the character "溪", which means stream or creek and is composed of the water radical (氵) with the phonetic component "奚". Together, they create a compound where "溯" describes the action of moving upstream and "溪" specifies the location, resulting in a term that literally means "to trace upstream along a stream", used to denote the activity of river trekking or canyoneering.