little by little; bit by bit; slowly and sparingly (often used for sipping or using something gradually).
お酒はちびちび飲んだ方が酔いがまわりにくい。
It's better to sip alcohol little by little so you don't get drunk quickly.
給料が少ないから、食材をちびちび使っている。
Since my salary is small, I'm using up ingredients sparingly.
彼はちびちびと貯金を続けている。
He continues to save money bit by bit.