Cause to swell is a phrase that can be used to describe a variety of activities. BLOAT, EGO, and ENGORGE are all words that can be used to describe this action. BLOAT is a five letter word that means to cause to become abnormally swollen or distended. EGO is a three letter word that refers to an individual's sense of self-importance or self-esteem. ENGORGE is a seven letter word that means to fill to excess or to gorge oneself. All three of these words can be used to describe the action of causing something to swell.