air line
arrest
beeline
bell
border line
bound
boundary
boundary condition
boundary line
bourn
break boundary
breakoff point
ceiling
check
checkmate
circumscription
compass
confine
cut
cutoff point
dead stop
deadline
deadlock
delimitation
determinant
division line
end
endgame
ending
extremity
final whistle
finish
floor
frontier
full stop
grinding halt
gun
halt
hedge
high-water mark
interface
limen
limit
limitation
limiting factor
line
line of demarcation
lockout
low-water mark
lower limit