Reinforce (verb)
To strengthen, especially by addition or augmentation.
“He reinforced the handle with a metal rod and a bit of tape.”
Reenforce (verb)
alternative spelling of re-enforce
Wiktionary
Reinforce (verb)
strengthen or support (an object or substance), especially with additional material
“the helmet has been reinforced with a double layer of cork”
Reinforce (verb)
strengthen (an existing feeling, idea, or habit)
“the next few months reinforced my opinion of Vince as a man of his word”
Reinforce (verb)
strengthen (a military force) with additional personnel or equipment
“paratroopers were sent to reinforce the troops already in the area”
Oxford Dictionary