宣戰 meaning in English

declare war▼(initiate a state of war)
verb
[UK: dɪ.ˈkleə(r) wɔː(r)] [US: dɪ.ˈkler ˈwɔːr]

declaration of war▼(a formal announcement by an entity that it is in a state of war with another entity)
noun
[UK: ˌde.klə.ˈreɪʃ.n̩ əv wɔː(r)] [US: ˌde.klə.ˈreɪʃ.n̩ əv ˈwɔːr]