Stick like a barnacle and Tack on

Tack on and stick like a barnacle are semantically related. In some cases you can use "Tack on" instead a verb phrase "Stick like a barnacle".

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

Stick like a barnacle and tack on are semantically related. Sometimes you can use "Stick like a barnacle" instead a verb "Tack on".