The spelling of "hath lock on" can be a bit confusing, as it uses archaic English verb forms and pronunciation. "Hath" is the third person singular present tense of "have," and is pronounced /hæθ/. "Lock" is pronounced /lɒk/ as in "lock and key," while "on" is pronounced /ɒn/. The phrase means to have control or power over something or someone. While not commonly used today, it can still be found in literature and historical texts.