This might be just a supplemental entry adding to an entry in the Main Volume.
irgþ
.Add :-- On yrhþe ł on fyrhto formidinem, Ps. L. 88, 41. Hwí wolde geðafian hé þæt his ðegen (St. Peter) hine for yrcðe swá oft wiðsóce?, Hml. Th. ii. 350, 3.
Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "irgþ." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 596.
, e : irgþu, irgþo ; indecl ; f. Sluggishness, cowardice, timorousness, pusillanimity :-- Wé witon georne ðæt hie for iergþe náðer ne durran ne swá feor friþ gesécan ne furþon hie selfe æt hám hie werian we know well that they from cowardice dare neither seek peace at such a distance, nor even defend themselves at home, Ors. 3, 9 ; Swt. 136, 28. For eówre forhtnysse and yrhþe ðe eów eglaþ propter cordis tui formidinem, qua terreberis, Deut. 28, 67.