The verbs to sparkle and to glitter are close synonyms and might well be favoured by supporters of the interchangeability criterion. Yet, it would be interesting to compare the following sets of examples:
A.His (her) eyes sparkled with amusement, merriment, good humour, high spirits, happiness, etc. (positive emotions).
B.His (her) eyes glittered with anger, rage, hatred, malice, etc. (negative emotions).
The combinability of both verbs shows that, at least, when they are used to describe the expression of human eyes, they have both emotive and evaluative connotations, and, also, one further characteristic, which is described in the next paragraph.
V.The causative connotation can be illustrated by the examples to sparkle and to glitter given above: one's eyes sparkle with positive emotions and glitter with negative emotions. However, this connotation of to sparkle and to glitter seems to appear only in the model "Eyes + Sparkle/Glitter".
The causative connotation is also typical of the verbs we have already mentioned, to shiver and to shudder, in whose semantic structures the cause of the act or process of trembling is encoded: to shiver with cold, from a chill, because of the frost; to shudder with fear, horror, etc.
To blush and to redden represent similar cases: people mostly blush from modesty, shame or embarrassment, but usually redden from anger or indignation. Emotive connotation can easily be traced in both these verbs.
VI.The connotation of manner can be singled out in some groups of verbal synonyms. The verbs to stroll — to stride — to trot — to pace — to swagger — to stagger — to stumble all denote different ways and