luxury, pride
侈 centers on excessive self-regard shown through lavish display: luxury and pride as two sides of the same indulgent attitude.
侈 combines 亻 (person) with 多 (many, much), suggesting a person surrounded by excess, which leads to luxury and pride.
A person 亻 with much 多: imagine someone flaunting piles of possessions, the very picture of luxury and pride.
For シ, picture a proud person showing off their luxury items, saying 'See!' as they gesture at their riches: see -> シ.