General terms:
* Repeat: This is the most straightforward way to describe the action. You can say "repeat the phrase" or "repeat the song lyric".
* Reiterate: This implies a stronger emphasis on the phrase, like you're trying to make a point by saying it again.
* Recite: This implies a more formal or literary setting, like reciting a poem.
* Hum: This specifically describes singing a phrase repeatedly, often in a quiet, low voice.
* Chant: This implies a rhythmic and often repetitive way of singing or saying a phrase, often used in rituals or protests.
More specific terms:
* Loop: This is used when the phrase is repeated in a continuous cycle, like in music or audio production.
* Drone: This refers to a sustained, monotonous repetition of a single note or phrase.
* Echo: This describes a repetition of a phrase with a delay, like an echo in a cave.
* Refrain: This is a specific part of a song that is repeated regularly, often after each verse.
Other options:
* Keep saying/singing: This is a simple and direct way to express the action.
* Say/sing it again and again: This emphasizes the repetitive nature of the action.
The best word to use will depend on the context and the desired effect.