/tu ækt vɒlənˈtərɪli/ – Phrase
Definition: hành động tự nguyện, cố ý, có chủ ý.
A more thorough explanation: To act voluntarily means to perform an action or engage in conduct of one’s own free will, without being compelled or coerced by external forces or influences. It implies that the individual has made a conscious choice to act in a certain way without being under duress or undue influence.
Example: The witness decided to act voluntarily and provide a statement to the police without being compelled to do so.