Usage patterns
稼ぎがあるto have income/earnings
I have a bit of income from a part-time job.
稼ぎがいいto earn well; to bring in good money
He earns well, so he's not struggling financially.
〈人〉の稼ぎで生活するto live off someone's earnings
I live off my husband's earnings.
稼ぎを増やすto increase one's earnings
I changed jobs to increase my earnings.
Expressions
板の間稼ぎbathhouse thievery; stealing clothes and valuables at a bathhouse