Make firm and Tack on

Tack on and make firm are semantically related in make secure topic. In some cases you can use "Tack on" instead a verb phrase "Make firm".

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

Make firm and tack on are semantically related in make secure topic. Sometimes you can use "Make firm" instead a verb "Tack on".