動詞
主動請求擔當某職責或任務 to ask for assignment of a job or task to themselves
班主任揾人搞班會活動，佢即刻自動請纓幫手。
班主任揾人搞班会活动，佢即刻自动请缨帮手。
The class teacher is looking for volunteers to organize the class activities, he immediately nominated himself to help.
Definitions (Wiktionary)
verb, figuratively
to volunteer for military service; to offer oneself for an assignment; to submit a request for a military assignment
verb, literary
to request a cord from the emperor (to bind the enemy)
Examples (粵典–words.hk)
Cantonese
班主任揾人搞班会活动，佢即刻自动请缨帮手。
班主任揾人搞班會活動，佢即刻自動請纓幫手。
The class teacher is looking for volunteers to organize the class activities, he immediately nominated himself to help.