granny shift
n.— «Some men were interned during the Troubles and no one knew when they were getting out, so often women were left to rear the children. So, it was vital that the women went out to work. Some women worked what was known as the “granny shift” for extra money. When their husband came home from work they went to the mill every night from 6-10pm.» —“Meet the Millies” Belfast Telegraph (Northern Ireland) Jan. 21, 2008. (source: Double-Tongued Dictionary)