room to spare
- extraAdditional, beyond necessary
- spaceUnoccupied area or interval
- breathing roomSpace for relief
- marginEdge of a page
- clearancePermitted passage or approval
leeway · slack · cushion · buffer · elbow room · wiggle room · surplus · excess · headroom · legroom · spacious · roomy · ample · plenty · overflow · leftover · gap · allowance
available space
room to spareno room
Absence of space
cramped · tight squeeze · packed · jam-packed · bursting at the seams
margin/buffer
room to sparestretched thin
Extended beyond comfortable limits
touch and go · tight · just enough · just barely · by the skin of one's teeth
resource availability
room to sparescarcity
Insufficiency of something needed
shortage · insufficient · inadequate · deficit · not enough