1. [late 16C+] useless, second-rate, out-of-date.
2. [mid-19C] grey-haired.
3. [late 19C–1970s] boring, gloomy, sick.
4. [1930s+] (also mowldy) very drunk.
1. [mid-19C–1950s] a copper coin.
2. [1900s] (Aus.) a punch, a blow.
[mid–late 19C] a servant wearing a grey powdered wig.
[mid-19C+] (Irish) stale, out of condition; thus phr. blue mouldy for want of a beating, looking for a fight, win or lose.