[qǐ jìn]
vigorously; energetically; enthusiastically; in high spirits;with gusto
work very energetically
工作很起劲
go at it with spirit
起劲地干着
The more they worked, the more energetical they became.
他们越干越起劲。
He warmed up as he went on with his speech.
他愈讲愈起劲。