in full swing
US /ɪn fʊl swɪŋ/
UK /ɪn fʊl swɪŋ/

1.
如火如荼, 全面展開
at the peak of activity or progress; fully active or operational
:
•
The party was in full swing by the time we arrived.
我們到的時候,派對已經如火如荼了。
•
Construction on the new building is now in full swing.
新大樓的建設現在已經全面展開。