Godan verb with 'ru' ending, Intransitive verbto taper to a point; to become pointed; to become sharp · to be on edge; to be nervous; to be irritable; to be touchy · to be sharp (of a voice, words, etc.); to be harsh; to be angry; to look displeased; to look sour

Godan verb with 'su' ending, Transitive verbto sharpen (e.g. pencil); to pout (e.g. lips) · to get nervous; to set one's nerves on edge · to raise (e.g. one's voice)