se détendre bedeutet auf Englisch

relax [relaxed, relaxing, relaxes]▼◼◼◼(to become less severe or tense)
verb
[UK: rɪ.ˈlæks] [US: rə.ˈlæks]

chill out▼◼◼◻(relax or take time out)
verb
[UK: tʃɪl ˈaʊt] [US: ˈtʃɪl ˈaʊt]

sit back▼◼◻◻(to relax, to not exert oneself)
verb
[UK: sɪt ˈbæk] [US: ˈsɪt ˈbæk]

chillax▼◼◻◻(relax)
verb

unbend [unbent, unbending, unbends]▼(to remove a bend)
verb
[UK: ˌʌn.ˈbend] [US: ˌʌn.ˈbend]