Grow a leg

Seeing something that makes you hard. I.E. third leg. The old kick stand. Tripod.

Your mom makes me grow a leg.

Grow Legs

Something that's likely to be stolen.

Keep an eye on your suitcase, it's liable to grow legs.

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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.

Don't let it grow legs

Means to not let a situation, feeling or idea get out of control...

X= "I've been having this feeling for my co-worker and I know it's wrong 'cause I'm married"

Y= "Wow man, I think it's serious, don't let it grow legs"

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