intransitive verb
Etymology: Middle English stepen in, from stepen to step + in — more at step
1. : to make a brief informal visit : drop in
step in and take your chocolate with her — Eizabeth Inchbald
2. : to enter into an affair or dispute often without invitation, permission, or welcome : intervene
if the local communities do not meet their responsibilities … the federal and state governments will step in — C.F.Hood