Favoritism — showing preferential treatment to a particular person or group (partiality/patronage).
贔屓の選手が試合に出るとつい応援してしまう。
When my favorite player appears in a match, I can't help cheering for them.
上司の贔屓で昇進したと噂されている。
There are rumors that they were promoted due to the boss's favoritism.
A favourite — something or someone especially preferred.
この店は私の贔屓だ。料理が美味しい。
This shop is my favorite. The food is delicious.
彼女はチームの贔屓だとみんなに言われている。
Everyone says she's the team's favorite.
A patron or supporter — someone who backs or sponsors (also used for a patron/customer).
あの料亭には長年の贔屓が多い。
That restaurant has many long-time patrons.