(Bloomberg) -- The greenback is approaching a make-or-break moment — at least as far as a closely watched technical indicator is concerned.

The Bloomberg Dollar Index has now surrendered more than 61.8% of its gains since May 2021, bringing it to one of the Fibonacci retracement levels popular among chart watchers. They tend to keep a close eye on these indicators to determine whether or not trends will extend or reverse. 

What happens next is therefore crucial. 

If the index remains below this point over the coming sessions, it would be a strong signal to traders that the currency’s losses are the beginning of a new longer-term downtrend, and not just an aberration.

The latest bout of weakness comes as the market now sees an end to a tightening spree that Federal Reserve officials begun communicating more than two years ago. The prospect is narrowing interest-rate differentials with other major currencies and weighing on the dollar. 

This week, it dropped to the weakest level against euro and pound since early 2022. It’s even falling out of favor against the yen — where rates are still negative — with the cross falling to a two-month low.

The bearish signal seen in the chart of the Bloomberg Dollar Index could be soon validated elsewhere too. The ICE Dollar Index — a popular alternative to the BBDXY — stands just 0.6% higher than the 61.8% Fibonacci retracement of a rally that kicked off in January 2021.

To be sure, options paint a more mixed picture. While long-term bets are supportive of the US currency’s prospects, sentiment over a one-month sentiment has reached its least bullish level since September 2020.

• NOTE: Vassilis Karamanis is an FX and rates strategist who writes for Bloomberg. The observations he makes are his own and are not intended as investment advice

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