Definition of loiters:
(v) :
To stand about without any aim or purpose; to stand about idly.
(v) :
To remain at a certain place instead of moving on.
(n) :
A standing or strolling about without any aim or purpose.
(v) :
(archaic) To stroll about without any aim or purpose, to ramble, to wander.
(v) :
(military, aviation) For an aircraft to remain in the air near a target.