reinforce
verb
[ riːɪnˈfɔːs ]
• strengthen or support (an object or substance), especially with additional material.
• "the helmet has been reinforced with a double layer of cork"
Similar:
strengthen,
fortify,
bolster up,
shore up,
buttress,
prop up,
underpin,
brace,
stiffen,
toughen,
support,
hold up,
underprop,
Origin:
late Middle English: from French renforcer, influenced by inforce, an obsolete spelling of enforce; the sense of providing military support is probably from Italian rinforzare .