List of tack on synonyms and tack on related words.
add, adjoin, affix, agglutinate, annex, append, attach, burden, complicate, conjoin, decorate, encumber, glue on, hitch on, infix, join with, ornament, paste on, plus, postfix, prefix, put with, saddle with, slap on, subjoin, suffix, superadd, superpose, tag, tag on, unite with