substrate: an indigenous language that contributes features to the language of an invading people who impose their language on the indigenous population
indigenous language: a language that originated in a specified place and was not brought to that place from elsewhere
vapor lock: a stoppage in a pipeline caused by gas bubbles (especially a stoppage that develops in hot weather in an internal-combustion engine when fuel in the gas line boils and forms bubbles that block the flow of gasoline to the carburetor)