get on one's soapbox

/ɡɛt ˌɒn wˈɒnz sˈəʊpbɒks/

/ɡɛt ˌɑːn wˈʌnz sˈoʊpbɑːks/

to get on one's soapbox

to express one's strong opinions or beliefs publicly and forcefully, often in a long and impassioned speech