Even though degree adverbs (e.g., swiþe) represent the most common intensification strategy in Old English, morphological devices are also very frequent, as expected in a predominantly synthetic language. This article studies synthetic intensification strategies in Old English with a focus on degree modification of adjectives and adverbs by means of spatial formatives (e.g., þurh- in þurhbitter 'very bitter' and for- in foreaþe 'very easily'), paying attention both to the features of the intensifying formative and to the characteristics of the intensified base.
Using the cognitive construct of the "Image Schema," I show that the original spatial meaning of the formatives can help explain their combinatorial preferences in terms of boundedness. Of all the items studied, for- stands out as the most grammaticalized Old English spatial intensifying formative: it is semantically opaque, is very productive with both adjectives and adverbs, and has a very wide collocational profile.