Singapore pegged its dollar to British Pound Sterling until the early 1970s, then to the US Dollar for a short period of time. From 1973 to 1985, Singapore pegged its currency against a fixed and undisclosed trade-weighted basket of currencies, reflecting its diversified trade links.
A strengthening U.S. dollar means that it now buys more of the other currency than it did before. A weakening U.S. dollar is the opposite – the U.S. dollar has fallen in value compared to the other currency – resulting in fewer U.S dollars being exchanged for the stronger currency.