The US dollar has strengthened against its global counterparts to become the top dog. This was supported by higher US Treasury yields as markets tempered bets for a March interest rate cut, with odds falling below 59% from 77% a day ago. 

Fed Governor Christopher Waller suggested that the Federal Open Market Committee (FOMC) does not need to ease its stance as quickly as in the past. This implies that the Fed may not be in a rush to implement monetary policy measures, such as interest rate cuts or other easing measures. 

The mention of proceeding with caution indicates that policymakers are taking a careful approach to any changes in monetary policy. This cautious stance can have significant implications for currency markets, affecting investors' expectations and risk appetite. 

As a result of Waller's statement and the overall cautious tone, the euro, British pound, and Australian dollar experienced sharp declines against the US dollar. This movement suggests a strengthening of the US dollar relative to these currencies. 

The mention of breaking critical thresholds implies that the currency pairs may have breached key technical levels or support levels, indicating a significant shift in market sentiment. 

Overall, the currency markets are reacting to the Federal Reserve's stance and the cautious approach signalled by Fed Governor Waller, which has led to a notable movement in currency pairs against the US dollar.  

Traders and investors are likely adjusting their positions based on these developments in the foreign exchange markets.