phoney war
noun/ˌfəʊni ˈwɔː(r)/
/ˌfəʊni ˈwɔːr/
[singular] (British English)- a period of time when two groups are officially at war but not actually fighting
（战争时期并未真正交战的）假战争 CultureThe best-known phoney war was the first six months of World War Two. Britain and France declared war against Germany in September 1939, but did not send any soldiers to fight until Germany attacked Denmark and Norway in April 1940.Topics War and conflictc2