déclasser signifie anglais

decommission [decommissioned, decommissioning, decommissions]▼◼◼◼(to take out of service or to render unusable)
verb
[UK: ˌdiːk.ə.ˈmɪʃ.n̩] [US: dik.ə.ˈmɪʃ.n̩]