Place this beep in the dialogue track at the exact moment of the masked word, then follow the reaction shot with a vine boom sound for a bigger reveal, or swap that follow-up for a dramatic dun dun dun when the covered line is meant as a cliffhanger.
Über diesen Sound
This clip is a clean electronic censorship beep lasting just over half a second, designed as a single sustained tone to sit over one word. It feels official and slightly awkward, making a covered line sound secretive or deliberately exaggerated for comedy. The metadata credits it as a stock effect from SoundJay.com.