Lockup rhymes with:
backup, breakup, buttercup, checkup, eggcup, hookup, linkup, makeup, markup, pickup, shakeup, stalcup, stallcup, teacup, wakeup, walkup, wisecup
Lockup sounds like:
lacava, lakeview, legaspi, ligachev, likhachov, liquefy, lisby, lisp, lissouba, lockaby, lookup, loschiavo, lugkov, lusby, luzhkov