A-hlǽnan

According to the Old English Dictionary:

a-hlǽnan

p. de; pp. ed [a, hlǽnan to lean] To set himself up; exsurgere :-- Se ðe hine selfne þurh oferhygda up ahlǽneþ he who through presumption sets himself up, Exon. 84a; Th. 316, 24; Mód. 53. [M. H. Ger. sich úf leinan: Ger. sich auflehnen.] a-hlænan