old-fashionedDEPEND/IT DEPENDS a trustyweapon, vehicle, animal etc is one that you have had for a long time and can depend on – often used humorously 〔武器、车辆、动物等〕忠实可靠的〔常为幽默用法〕SYN reliable
a prisoner who is given special jobs or rights, because they behave in a way that can be trusted 〔由于表现好而受到优待的〕模范囚犯
Examples from the Corpus
trusty• She communicated instead with a small group of trusties like Lord Young, and advisers within her policyunit.• A few weeks later, the trusties shared the news: he'd shot himself.• The trusties of Internal Order had added their voices and they, too, were ignored.