padlocking is padlock's Present Participle

padlock

US [ˈpædlɑk]

UK [ˈpædˌlɒk]

Plural Form：padlocks Present Participle：padlocking Past Tense：padlocked

Coll.

adj.+n.

n.	1. 挂锁,扣锁
v.	1. (用挂锁)锁上

1.	加锁 GB/T 5271.8-2001 信息技术... ... 08.08.02软件盗版 software priacy 08.08.03加锁 padlocking 08.08.04设坏扇区 bad sectoring ... www.wwwstandard.cn\|Based on 4 pages
2.	视锁定 ...t)、空中加油(Air Refueling)及目视锁定(Padlocking)设定为适当的选项。 www.docin.com\|Based on 4 pages

n.	1. a lock that you can fix to something such as a gate, bicycle, or suitcase. It has a curved bar on top that moves when you open the lock with a key
v.	1. to fix a padlock to something so it cannot be opened or moved