English Translation
Give me a hand.
prêter main forte à quelqu’un = to lend somebody a hand
© Larousse 2014
I think “prêter main forte” is an expression you will mostly find in older books.
There is also “donner un coup de main”, which is much more common.
Donne-moi un coup de main!
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similar to English, give me a hand not lend me a hand.
If you say lend me a hand, someone would joke, I want it back.
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That’s pretty funny… 
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