bóc-tǽcing
This might be just a supplemental entry substituting part of an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
bóc-tǽcing
-talu. Substitute: Teaching or direction contained in books Godcunde bóte séce man georne and symble be bóctǽcinge (bóctale, v. l.) according to the directions contained in books (e. g. Theodore's Liber Poenitentialis) (or as books tell), Ll. Th. i. 398, 22.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.