(someone's) butt is on the line

American & Australian, very informal!

if someone's butt is on the line, they are in a situation where they will be blamed if things go wrong.

It's my butt on the line if we don't make this delivery today, so get moving guys.

• dance to tune
• dance up a storm
• darkest hour is just before the dawn.
• dark horse
• dark-horse
• Davy Jones's locker
• dawn on
• dawn on you
• day after day
• day and night
• day by day
• day in, day out
• day late and a dollar short
• daylight robbery
• day of reckoning
• days are numbered
• day-to-day
• dead as a doornail
• dead duck
• dead end
• dead-end
• dead hand of
• dead hand of something
• dead in the water
• dead letter