We must also say farewell to “leant” as the perfect form of “lean”.  Although it sounds old to my ears, Google’s Ngram viewer tells me that it was in fairly robust use from 1870 through 1930, so I believe I must not call it archaic.  It’s in the category, I believe, of “dreamt”, a word of my mother’s.  In fact, the Oxford English Dictionary teaches us that “leant” is the straightforward past participle (note that Tolkien does not use it participally in the sample below.  Intriguing).  As “lean” is solidly in the Ten Thousand most common words, away it goes, along with leapt!

Note also that now I have discovered Google’s Ngram viewer.  Someone feed my kids, I have more exciting things to play with!

• 08.001  that leant together,

“lean, v.1.” OED Online. Oxford University Press, March 2015. Web. 3 June 2015.