The term 'swelled head' is a phrase used to describe someone who has an inflated sense of self-importance. This can be seen in the crossword solutions for the term, which include EGO (3 letters), EGOTIST (7 letters), ESS (3 letters), CONCEIT (7 letters), BIGHEAD (7 letters), and ARROGANCE (9 letters). Each of these words describes someone who is overly proud of themselves and their accomplishments, and who may act in a superior manner towards others.