n.
Function: intransitive verb
Date: 13th century
1 : to build or occupy a nest : settle in or as if in a nest
2 : to fit compactly together or within one another : EMBED
transitive verb
1 : to form a nest for
2 : to pack compactly together
3 : to form a hierarchy, series, or sequence of with each member, element, or set contained in or containing the next < nest ed subroutines>