What is the meaning of the word "swelter"?

The word "swelter" means to suffer from or be overcome by great heat. This meaning conveys a sense of discomfort or distress due to high temperatures, often associated with excessive heat in the atmosphere. When someone swelters, they are typically feeling overwhelmed by the heat, which could relate to physical exertion, outdoor conditions, or merely being in a hot environment.

The other options do not align with this definition, as they suggest feelings of comfort, energy, or engaging in discussions, none of which relate to experiencing discomfort due to heat. Thus, the choice that reflects the essence of the word "swelter" captures the right context of heat-induced suffering.