What is the process called when one stops the flow of a liquid?

The term that describes the process of stopping the flow of a liquid is "stanch." This word has its origins in Middle English and can also imply the action of preventing a liquid, especially blood, from flowing any further, commonly used in medical contexts. It conveys a sense of an active intervention to stop or slow down the movement of fluids. This action is crucial in various scenarios, such as in wound care or containment of spills.

Stygian refers to something related to the river Styx, often associated with darkness and gloom, and does not pertain to liquids or their flow. Solder refers to a metal alloy used to join two or more items together, typically in electronics or plumbing, rather than stopping liquid flow. Salacious relates to an interest in sexual matters and has no connection to liquid dynamics at all. Thus, stanch is the only term that directly addresses the action of halting the movement of a liquid, making it the correct choice.