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grow arms and legs 

To become substantially more complicated, especially when this was unforeseen. Colloquial expression, primarily used in (British) English. Origin: by analogy to human biological development in the womb.
The project seemed simple at first, but now it's starting to grow arms and legs.
grow arms and legs by mattgemmell September 1, 2015

full of arms and legs 

To be pregnant, to the point of definately being obvious that there is a baby inside of you
Kylie can't come out with us anymore.
Yeh i havent seen her for ages, whats with that?
She's full of arms and legs.
Oh, ok.

OR

Look at that bird over there, is she chock full of arms and legs or what?
full of arms and legs by jamie_ledge September 6, 2008

Legs and arms 

The most iconic nickname for Allegra others include amanbun and amegra
Legs and arms is so iconic