safe as houses
Totally secure, as in If you buy Treasury bonds, your money will be safe as houses but you won't get a large return. In today's security-conscious climate, where alarm systems to deter housebreaks have become increasingly common, this simile may seem puzzling. Presumably it uses house in the sense of “a shelter from the elements.” [Late 1800s]
Words nearby safe as houses
safari suit,
safavid,
safe,
safe and sound,
safe area,
safe as houses,
safe harbor,
safe house,
safe period,
safe seat,
safe sex