headroom

US /ˈhed.ruːm/
UK /ˈhed.ruːm/
"headroom" picture
1.

the amount of space above someone's or something's head, especially in a vehicle or room

:
•
The car has excellent headroom, even for tall passengers.
•
Mind your head, there's not much headroom in this attic.
:
clearanceoverhead spacevertical space
2.

the capacity for further growth or development

:
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The company still has plenty of headroom for expansion in new markets.
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The budget has some headroom for unexpected expenses.
:
potentialcapacityscopelatitudeleeway