She enjoyed a dual relationship with Maria.The phone has a dual SIM function.His dual nationality led to many benefits.
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Duel
/ˈdjuːəl/
A formal fight or competition between two people, often to settle a disagreement
Examples:
A duel at dawn settled their longstanding rivalry.Honour was to be defended by a duel on that fateful day.They faced each other in a duel, armed with swords and pride.
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Ways to tell them apart:
Dual and duel may sound alike, but their meanings are quite different.
The word dual has an a as in also which signifies two aspects or parts, just like how also implies an addition or something more.
On the other hand, duel includes an e and refers to a battle or struggle, aligning with the e for engage.
Remember that dual often describes something that is double, hence the a is for addition.
Use duel when discussing competition or conflict, which hints at using energy; thus capturing the e.