1954, Allen Ginsberg, Journal entry in Gordon Ball (ed.), Journals, New York: Grove, 1977, p. 70,
Pink bedroom lamp, shade atilt over Uncle Abe’s ancient clean radio,
adverb
At an angle from the vertical or horizontal; at the point of falling over.
He wore his hat rakishly atilt.
Tilting or as if tilting (charging with a lance, like a knight on horseback in a joust).
to run / ride atilt at someone or something
1895, F. F. Montrésor, Into the Highways and Hedges, New York: Appleton, Part 2, Chapter 9, p. 235,
Other people may ride atilt against all the problems one bruises head and heart over. Good luck go with them, and more power to their elbows!
preposition
Diagonally over or across.
1982, Jean Scott Wood Creighton (as J. S. Borthwick), The Case of the Hook-billed Kites, New York: St. Martin’s Press, Chapter 11, p. 29,
[He] was balanced atilt a wooden chair, his legs resting on a low file cabinet.