Curl up and Tack on

Curl up verb - To sit or recline comfortably or cozily.

Tack on and curl up are semantically related. In some cases you can use "Tack on" instead a verb "Curl up".

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

Curl up and tack on are semantically related. Sometimes you can use "Curl up" instead a verb "Tack on".