Fix

dose

(a single dose of an addictive drug)

réparation

(an instance of fixing)

fixer

(to attach; to affix; to hold in place)

préparer

(to prepare)

réparer

(to mend or repair)

stériliser

(to render an animal infertile)

tricher

(to make a contest, vote, or gamble unfair)

truquer

(to make a contest, vote, or gamble unfair)