“随而定”较为贴合的英文表达可以是 “to be determined accordingly” 或 “to be decided as appropriate”，具体可根据语境选择：
“to be determined accordingly”： 强调根据某种情况或条件来做出相应的决定，带有一种灵活应变、依据实际情况来定的意味。例如：The final date of the meeting is to be determined accordingly.（会议的最终日期将随而定。）
“to be decided as appropriate”：侧重于在合适的时机或基于合适的考虑来做出决定。例如：The specific arrangements will be decided as appropriate.（具体安排将随而定 。）