Meaning/Usage: To help someone(去幫助某人)
Explanation: A physical task is usually done with the hands. Giving someone a hand is letting them borrow your hands, or in other words, helping them out.
"Give a hand" also represent applauding, but this section is about helping someone.
"Can you give me a hand setting up the dining table?"
"I'm going to need a hand changing the tire on the car."
"Are you going to have time to give me a hand tomorrow?"
"Let me know if you need help. I'll have time all day today to give you a hand."
A: "When are you going to move into your new apartment?"
B: "I want to, but I'm going to need some help."
A: "I have time this weekend. Do you want me to give you a hand?"
B: "That would be great."
Other Common Sentences
"Can I get your help on this?"
"Can you help me out?"
"Do you need any help?"
"Let me know if you need any help."