13 possible answers to
Answers with 4 characters: PROP Answers with 5 characters: BRACE SINEW STEEL Answers with 6 characters: ANNEAL BEEFUP Answers with 7 characters: NOURISH ENSTEEL FORTIFY SHOREUP Answers with 8 characters: BUTTRESS Answers with 9 characters: REINFORCE Answers with 10 characters: INTENSIPHI