noun ( sometimes initial capital letter ) a very timid, unassertive, spineless person, especially one who is easily dominated or intimidated: a milquetoast who's afraid to ask for a raise.
Also called Caspar Milquetoast.
Origin:
1935–40, Americanism; after Caspar Milquetoast, a character in The Timid Soul, comic strip by H. T. Webster (1885–1952), American cartoonist