English Vocabulary in Use - 60 Time: once in a blue moon

once in a blue moon

very infrequently

all his born days

all his life

in a mo / in a sec / in a tick / in less than no time / in a jiffy

very soon

for donkey’s years / since the year dot

for a long time

till the cows come home

for ever

for keeps / for good

to keep for ever

in the nick of time

only just in time

over the hill / past it

too old

has-been

person who is no longer famous

in a flash / at a rate of knots

very quickly

fleeting

brief or quick

lengthy

continuing for a long time

transient

lasting for only a short time; formal

persistent

lasting for a long time or hard to stop or get rid of

inexorable

continuing without hope of being stopped; formal

incipient

just beginning; formal

protracted

lasting for a long time or made to last longer; formal

lingering

taking a long time to leave or disappear

simultaneous

happening at the same time

duration

amount of time that it lasted

prolong

make it last longer

at short notice

just a short time before it is due to happen

repeatedly

many times