British & Australian, old-fashioned, very informal

a sexually attractive woman.

Who was that nice bit of skirt I saw you with last night?

• be on the fiddle
• be on the fritz
• be on the game
• be on the heavy side
• be on the horns of a dilemma
• be on the large side
• be on the level
• be on the line
• be on the loose
• be on the march
• be on the mend
• be on the money
• be on the piss
• be on the ragged edge
• be on the razzle
• be on the receiving end
• be on the right lines
• be on the right side of
• be on the right track
• be on the rocks
• be on the ropes
• be on the run
• be on the safe side
• be on the same wavelength
• be on the scrap heap