Grammar fix
lend a hand
help someone out
To help someone with something, usually in a friendly, informal way.
expressionB1common
Hear it in context
Notice where the phrase sounds natural.
I've got an hour free if you need someone to lend a hand.
A: This is a lot to carry on my own.
B: Here, let me lend a hand.
Fix the pattern
One small grammar move makes it sound right.
Not: Can you lend me a help?
Say: Can you lend me a hand?
The fixed phrase is 'lend a hand', not 'lend a help'.