Definition of milquetoast in US English:

milquetoast

(also Milquetoast)

noun

North American
  • A person who is timid or submissive.

    as modifier ‘a soppy, milquetoast composer’
    • ‘Alarms ring when Garvin speaks of applying to the Olympic Village design standards like those that produced the Milquetoast, nothing-ventured buildings at Battery Park City.’
    • ‘Charlie is the self-effacing, Milquetoast dude who allows people to walk all over him.’
    • ‘Enter Ray Rhodes, a highly regarded defensive troubleshooter with a knack for resurrecting Milquetoast units.’

Origin

1930s: from the name of a cartoon character, Caspar Milquetoast, created by H. T. Webster in 1924.

Pronunciation

milquetoast

/ˈmɪlktoʊst//ˈmilktōst/