What is the meaning of linger on? - Question about English (UK)

Definition of linger on It almost means to think about it for a while for example “they lingered on whether they made the right decision”|To remain persistently or for a longer time than anticipated. I just wanted to go home after the seminar finished, but a number of attendees were still lingering on in the lobby.
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What is the meaning of linger on? - Question about English (UK)