IPA: /dɪsˈkənˌsɜrt/
KK: /dɪsˈkɒnˌsɜrt/
To make someone feel confused or worried, often by disrupting their calm or confidence.
The unexpected news served to disconcert her during the meeting.
Past: disconcerted
Past Participle: disconcerted
Disconcert is formed from "dis-" (meaning apart or away) and "concert" (from Latin "concertare", meaning to bring together or to agree). The word describes the act of causing someone to feel unsettled or thrown off from a state of agreement or composure.
Think of being 'thrown off' or 'disturbed' ('dis-') from a state of 'harmony' or 'agreement' ('concert'). This helps you remember that disconcert means to unsettle someone.