in the bleed period of the menstrual cycle. Euphemistic abbreviation of, or an alternative to, ON THE RAG or 'on (your) period' UK, 1971.

ready and willing UK, 1888.

willing to take part AUSTRALIA, 1880.

willing to take part in an amorous liaison AUSTRALIA, 1907.

dating AUSTRALIA, 1945.

(of a fight or dispute) begun in earnest AUSTRALIA, 1945.

persistently asking AUSTRALIA, 1969.

of a criminal enterprise, under way UK, 1969.

possible, feasible, worthy of an attempt. Originally recorded in use among billiard and snooker players UK, 1935.

having secured a bet AUSTRALIA, 1903.

protected from policy action by bribes US, 1973.

of a food dish, on the menu UK, 1949.

drug-intoxicated US, 1946.► not onnot going to happen; forbidden AUSTRALIA, 1972

(used of a drug) under the influence of US, 1925.

so as to affect or disadvantage IRELAND, 1880.

to the detriment of, or the disadvantage of, or the ruin of, etc UK, 2000.

at or in (a place) AUSTRALIA, 1853.

to be paid for by US, 1871.► be on aboutto talk in such a manner that the speaker is not entirely understood or listened to by the auditor. As in, 'What's he on about now?' UK, 1984.► be on atto nag, to constantly reprove UK, 1974.► go on about; be on aboutto grumble; to complain, especially loudly; to talk on a subject for far too long UK, 1863