じりじり， ジリジリ， ぢりぢり， ヂリヂリ
1. slowly (but steadily), gradually, bit-by-bit
2. irritatedly, impatiently
3. scorchingly (of the sun)
4. sizzling (i.e. sound of frying in oil)
5. sound of a warning bell, alarm clock, etc.
6. oozing out (oil, sweat, etc.), seeping out
tbd