drop
to work until you drop

hold on
he held on to his decision until the end

hold over
...held over until the next day

keep at
to keep at somebody until...

meet
until we meet again

notice
until further notice

now
until now / up to now

present
until the present / up to the present / up to the present time

recently
until quite recently

right
go right on until you come to a square

stand up
...stood out until their ammunition was exhausted

stay out
the boys stayed out until eleven o'clock

then
until then

until
until next week!