1) to be sick
2) metaphorically of any ailment of the mind
2a) to be taken with such an interest in a thing as amounts to a disease, to have a morbid fondness for
Part of Speech: verb
Citing in TDNT: 4:1091, 655
From G3554; to be sick, that is, (by implication of a diseased appetite) to hanker after (figuratively to harp upon): - dote.