be dead on (your) feet

to be very tired.

I've spent the whole day cleaning the house and I'm dead on my feet.

• the bottom line
• the bottom of the barrel
• the bottom of the heap
• the bottom of the hour
• the bottom of the ladder
• the boys in blue
• the brains behind
• the brains behind something
• the brass ring
• the bright lights
• the bright side
• the bubble bursts
• the buck stops here.
• the buck stops with
• the buck stops with .
• the buck stops with someone
• the buck stops with someone.
• the bum's rush
• the bush telegraph
• the business end
• the business end of
• the business end of something
• the calm before the storm
• the cards are stacked against
• the cards are stacked against someone