ROGET THESAURUS
clap on
Addition
VB
add, annex, affix, superadd, subjoin, superpose,
clap on, saddle on, tack to, append, tag, ingraft, saddle with, sprinkle, introduce, insert, become added, accrue, advene, supervene, reinforce, reenforce, restrengthen, swell the ranks of, augment.