half a dollar
noun
1
a prison sentence of 50 years US, 1990.
2
a half-crown coin; two shillings and sixpence. Pre-decimalisation, that is pre-1971, a half-crown coin was valued at two shillings and sixpence (equivalent to 12Ѕ p), and, presumably, at the point of coinage, a pound was worth approximately four US dollars UK, 1916