1. to groan, to moan

Godan verb with 'ru' ending intransitive verb

2. to roar, to howl, to growl

intransitive verb Godan verb with 'ru' ending

3. to hum (engine, wind, etc.), to buzz, to whiz, to sough, to make a low, dull sound

intransitive verb Godan verb with 'ru' ending

4. to ooh and aah (in admiration)

Godan verb with 'ru' ending intransitive verb

5. to sing in a strong, low voice (esp. traditional chant or recitation)

Godan verb with 'ru' ending transitive verb

6. to be about to burst, to overflow

Godan verb with 'ru' ending intransitive verb