Batten down and Tack on

Batten down verb - Furnish with battens.

Tack on and batten down are semantically related. In some cases you can use "Tack on" instead a verb "Batten down".

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

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