From Longman Dictionary of Contemporary Englishthe straight and narrowthe straight and narrowold-fashionedHONEST an honest and morally good way of life → straight
Examples from the Corpus
the straight and narrow• She was frigid and strait-laced and therefore somewhat ill-equipped to keep me on the straight and narrow.• This will help you, both physically and psychologically, to get back on to the straight and narrow.• You may be able to keep us to the straight and narrow. 