Lowest odds about United being toast? (7,2)
I believe the answer is:
bottoms up
'being toast?' is the definition.
(I've seen this before)
'lowest odds about united' is the wordplay.
'lowest' becomes 'bottom' (synonyms).
'odds' becomes 'sp' (betting abbreviation for starting price).
'about' indicates putting letters inside.
'united' becomes 'U' (as in Man U, Manchester United).
'sp' going around 'u' is 'sup'.
'bottom'+'sup'='BOTTOMS UP'
(Other definitions for bottoms up that I've seen before include "Down the hatch!" , "Your good health!" , "down it goes!" , "Cheers!" , "Toast" .)