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80TacticalTrading says
Let's say you are long a sept call on xyz - that call is going to expire on 9-17.
The call that you bought is a 25 call, and on expiration date the underlying is at 30 - you also think that there is no resistance until 35.
So instead of simply selling your call at expiration, and missing what you think is 5 points of movement - you sell your sept 25 call and then buy an oct 30 call.
By doing this you will have rolled over your option - you will have rolled it from sept to oct.
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