Phrase 'coup de foudre'

[Rebbekka Hirsch]

I heard a phrase 'coup de foudre' - what does that mean as a phrase? The words by themselves do not seem to go together to have an obvious meaning.
Thanks!

[Frank]

Hi Rebbekka,

"Coup de foudre" is an expression which means love at first sight.

HIH,

-Frank.

[Crack1]

Sometimes I wonder why we don't talk about love at second sight, love at third sight, etc.