I push, but do not shove. I float, but don’t normally sink. I have sisters, but no brothers. What am I?

Answer: A tug

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i put you on my table i cut you but nobody eat you
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I remain unseen but hold many things, and when you are making a decision you consult me. What am I?
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I run up and down the stairs without moving. What am I?
I run, yet I have no legs. What am I?
I save lives on the ground and in the air. What am I?