1.
Elbow room is the freedom to do what you want to do or need to do in a particular situation. ( INFORMAL )
His speech was designed to give himself more political elbow room.
= leeway
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2.
If there is enough elbow room in a place or vehicle, it is not too small or too crowded. ( INFORMAL )
There was not much elbow room in the cockpit of a Snipe.
= space
N-UNCOUNT