успокоиться bedeutet auf Englisch

settle down▼(to become quiet)
verb
[UK: ˈset.l̩ daʊn] [US: ˈset.l̩ ˈdaʊn]

calm [calmed, calming, calms]▼(to become calm)
verb
[UK: kɑːm] [US: ˈkɑːm]

calm down▼(To become less excited)
verb
[UK: kɑːm daʊn] [US: ˈkɑːm ˈdaʊn]

cool [cooled, cooling, cools]▼(to become less intense, e.g. less amicable)
verb
[UK: kuːl] [US: ˈkuːl]

cool down▼(to become less agitated)
verb
[UK: kuːl daʊn] [US: ˈkuːl ˈdaʊn]

quiet [quieted, quieting, quiets]▼(to become quiet or calm)
verb
[UK: ˈkwaɪət] [US: ˈkwaɪət]

subside [subsided, subsiding, subsides]▼(to fall into a state of calm; to settle down; to become tranquil; to abate)
verb
[UK: səb.ˈsaɪd] [US: səb.ˈsaɪd]