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love or lust
Susan had to be put into braces due to her weak knees.
It's not an idiom - it's a description of what happens when you get nervous and excited. Your legs feel wobbly and you might even fall over because your knees get weak and collapse underneath you.
Weak Knees - 1927 was released on: USA: 20 June 1927
Weak Knees - 1925 was released on: USA: 1 February 1925
It means you like the person.
deadpool
The cast of Weak Knees - 1925 includes: Cliff Bowes Virginia Vance
The cast of Weak Knees - 1927 includes: Henry Roquemore Lewis Sargent Wanda Wiley
Delayed Teen Angst - 2009 Weak in the Knees 1-5 was released on: USA: 6 June 2009
90210 - 2008 Sweaty Palms and Weak Knees 2-17 is rated/received certificates of: Netherlands:6 USA:TV-14