wax poetic

From wax (“become”) + poetic.

• (UK) IPA^(key): /ˈwæks pəʊˈɛtɪk/
• (US) IPA^(key): /ˈwæks poʊˈɛtɪk/

wax poetic (third-person singular simple present waxes poetic, present participle waxing poetic, simple past and past participle waxed poetic)

1. (intransitive) To become increasingly verbose.
2. (often derogatory, intransitive) To speak in an increasingly verbose manner, as if constructing poetry.

• wax eloquent