Can’t afford a subscription to the online OED? No problem, sort of, for the next few weeks—to promote the new BBC TV series Balderdash and Piffle, they’re providing free access at certain times, as this page explains:
Until 13 February, you can use the OED to look up any word starting with the letters featured in the programmes—or pick a quick link to see one of the words highlighted this week.
Any time until 13 February you can look up any words beginning with this week’s letter, or with any of the previous letters of the week.
For 48 hours after each programme (from 22:00 GMT on Mondays to 22:00 GMT on Wednesdays) you can look up any words, beginning with any letter, in the whole of the OED.
(Emphasis theirs.) Thanks go to Grant Barrett for the tip; be sure to take full advantage of this generous offer!