dog days
plural noun
1- chiefly poetic/literary the hottest period of the year (reckoned in antiquity from the heliacal rising of Sirius, the Dog Star)〈主诗/文〉三伏天; 酷热期（古时认为从与太阳同时出没的天狼星出现开始）。
1.1
- a period of inactivity or decline不活跃期; 淡季：
these are indeed dog days for British film production.
这些日子真是英国电影制造业的低潮时期。