A method comprising: receiving, at data processing hardware, audio data corresponding to an utterance spoken by a user and captured by a user device associated with the user; processing, by the data processing hardware, using a speech recognizer, the audio data to determine that the utterance includes a query for a digital assistant to perform an operation, wherein the speech recognizer is configured to trigger endpointing of the utterance after a predetermined duration of non-speech in the audio data, wherein processing the audio data to determine that the utterance includes the query for the digital assistant to perform the operation comprises: processing, using the speech recognizer, the audio data to generate a speech recognition result for the audio data; and performing semantic interpretation on the speech recognition result for the audio data to determine that the audio data includes the query to perform the operation; and before the predetermined duration of non-speech in the audio data: detecting, by the data processing hardware, a freeze word in the audio data, the freeze word following the query in the utterance spoken by the user and captured by the user device; and in response to detecting the freeze word in the audio data: triggering, by the data processing hardware, a microphone closing event at the user device to prevent the user device from capturing any audio subsequent to the freeze word; modifying, by the data processing hardware, the speech recognition result for the audio data by stripping the freeze word from the speech recognition result; and instructing, by the data processing hardware, using the modified speech recognition result, the digital assistant to perform the operation requested by the query. receiving, at data processing hardware, audio data corresponding to an utterance spoken by a user and captured by a user device associated with the user; processing, by the data processing hardware, using a speech recognizer, the audio data to determine that the utterance includes a query for a digital assistant to perform an operation, wherein the speech recognizer is configured to trigger endpointing of the utterance after a predetermined duration of non-speech in the audio data, wherein processing the audio data to determine that the utterance includes the query for the digital assistant to perform the operation comprises: processing, using the speech recognizer, the audio data to generate a speech recognition result for the audio data; and performing semantic interpretation on the speech recognition result for the audio data to determine that the audio data includes the query to perform the operation; and processing, using the speech recognizer, the audio data to generate a speech recognition result for the audio data; and performing semantic interpretation on the speech recognition result for the audio data to determine that the audio data includes the query to perform the operation; and before the predetermined duration of non-speech in the audio data: detecting, by the data processing hardware, a freeze word in the audio data, the freeze word following the query in the utterance spoken by the user and captured by the user device; and in response to detecting the freeze word in the audio data: triggering, by the data processing hardware, a microphone closing event at the user device to prevent the user device from capturing any audio subsequent to the freeze word; modifying, by the data processing hardware, the speech recognition result for the audio data by stripping the freeze word from the speech recognition result; and instructing, by the data processing hardware, using the modified speech recognition result, the digital assistant to perform the operation requested by the query. detecting, by the data processing hardware, a freeze word in the audio data, the freeze word following the query in the utterance spoken by the user and captured by the user device; and in response to detecting the freeze word in the audio data: triggering, by the data processing hardware, a microphone closing event at the user device to prevent the user device from capturing any audio subsequent to the freeze word; modifying, by the data processing hardware, the speech recognition result for the audio data by stripping the freeze word from the speech recognition result; and instructing, by the data processing hardware, using the modified speech recognition result, the digital assistant to perform the operation requested by the query. triggering, by the data processing hardware, a microphone closing event at the user device to prevent the user device from capturing any audio subsequent to the freeze word; modifying, by the data processing hardware, the speech recognition result for the audio data by stripping the freeze word from the speech recognition result; and instructing, by the data processing hardware, using the modified speech recognition result, the digital assistant to perform the operation requested by the query.