1950s Hull Yorkshire.

'All-ee, all-ee in' to gather participants together for whatever reason. Any hide and seek game ranging over a fair distance down back streets, particularly for re-alley-o (Relievo) but Block as well.

I don't remember it being used in long-rope skipping as there was usually a rhyme or chant to call everyone in to this. 'All in together, girls, this fine weather, girls' etc.