Keep within limits and Tack on

Tack on and keep within limits are semantically related. In some cases you can use "Tack on" instead a verb phrase "Keep within limits".

Tack on verb - To join (something) to a mass, quantity, or number so as to bring about an overall increase.

Keep within limits and tack on are semantically related. Sometimes you can use "Keep within limits" instead a verb "Tack on".