on one's own initiative

without being prompted by others

主动地

take (或 seize) the initiative

be the first to take action in a particular situation

带头，采取主动

anti-hunting groups have seized the initiative in the dispute.

反狩猎组织在争论中采取了主动。

on (one's) own initiative

Without prompting or direction from others; on one's own.

自主的：没有他人的怂勇或指导的；自己做主的