help (someone) off
1. To help someone to alight from something. I took the elderly woman's hand and helped her off the train.
2. To help someone to remove an item or article of clothing. We stepped into the restaurant, and I helped my date off with her coat.
help someone off (of) something
to help someone get off something. (Of is usually retained before pronouns.) Please help me off this horse! Do help him off of it!
help (someone) off
To assist (someone) in taking off a piece of clothing: Help me off with these boots.