1. to make fat, fatten , (Euripides); π. χθόνα to fatten the soil, of a dead man, (Aeschulus Tragicus):—;Pass. to be or become fat , (Plato Philosophus), etc.

2. metaphorically,

3. to increase, enlarge , πλοῦτον (Pindar)

4. to make wanton, excite , (Aeschulus Tragicus): —;Pass. to wax fat and wanton , (Aeschulus Tragicus); ἔχθεσιν πιαίνεσθαι to batten on quarrels, (Pindar) (ML)