• lose one's reason

• lose one's cool

• blue-eyed boy

• at a loose end

• lose face

• all hell breaks loose

• lose sight of

• lose touch

• a skinflute

• got the blues

• black and blue

• lose track of it

• lose one's head

• in a blue funk

• between he devil and the deep blue sea

• once in a blue moon

• play a losing game

• meet one's Waterloo

• blue blood

• lose ground

• lose heart

• a bolt from the blue

• keep lose one's temper

• lose one's nerve

• loom large

• to really blow blew it

• lose sleep

• have a tile loose

• the lunatic fringe

• keep lose track of it

• lose your bearings