n.
Function: intransitive verb
Date: 1792
1 a : to create or be in a state of restless activity especially : to shower flattering attentions < fuss ing over the grandchildren> b : to pay close or undue attention to small details < fuss ed with her hair>
2 a : to become upset : WORRY b : to express annoyance or pique : COMPLAIN
transitive verb : AGITATE , UPSET
– fuss · er noun