Are as good as their word - Idioms by The Free Dictionary
be as good as (one's) word (redirected from are as good as their word)
be as good as (one's) word
To be reliable and truthful. Said of one who typically follows through on one's promises. Tom is as good as his word—if he promised to help you move, then he'll be here.
be as good as your word do what you have promised to do.
be as ˌgood as your ˈword do what you have promised to do: You’ll find that she’s as good as her word — she always comes if she says she will.