朗文當代英語詞典
wax lyrical etc about
to talk with extreme feeling, liking or pleasure about something - used humorously
例句：Journalists wax lyrical about the band.
wiki
wax lyrical
To talk about something with much interest or excitement; To become, or tend to become lyrical
to talk with enthusiasm and alacrity using well chosen words.
To praise something or someone.
It means to talk positively about someone or something.
/Q/What_does_wax_lyrical_mean
這些來源都可以作為佐證