to-ing and fro-ing
noun [ U ] uk/ˌtuː.ɪŋ ən ˈfrəʊ.ɪŋ/ us/ˌtuː.ɪŋ ən ˈfroʊ.ɪŋ/
来来回回；往复
repeated movement from one place to another
Inevitably, when both parents have custody of the child, there's a lot of to-ing and fro-ing between them for the child concerned. 当父母双方都对孩子有监护权时，孩子不可避免地要在父母之间不断地来回奔波。
(also to-ings and fro-ings)纷繁复杂，繁琐，忙乱
many different and repeated discussions and activities
The legal to-ings and fro-ings could delay the start of the trial. 繁琐的法律程序可能会使开审的时间推迟。