it would not do sb any harm

/ɪt wˈʊdənt dˈuː sˈʌmwɒn ˌɛni hˈɑːm/

/ɪt wˈʊdənt dˈuː sˈʌmwʌn ˌɛni hˈɑːɹm/

used to refer to something as a good idea or a reasonable choice