CAP413 (UK R/T phraseology) has this to say which I think wraps it up nicely:
HOVER’ describes a manoeuvre where the helicopter holds position whilst airborne in ground effect, waiting to proceed. Hover allows spot/ axial turns (i.e. about the central axis of the helicopter). When required, further instructions should subsequently be transmitted to permit the helicopter to proceed
Wonder what these chaps are doing if not hovering? Ground effect? CAP needs a little rework if that's all it has to say I feel, certainly doesn't wrap it up nicely.