old hat
Longman Dictionary of Contemporary English 5++LDOCE 5++ˌold ˈhat adjective [not before noun] OLD-FASHIONEDUSED TO/ACCUSTOMED TOif something is old hat, a lot of people have said or done the same thing before and it is therefore not new or interesting 陈旧的，过时的，老一套的 Most of this is probably old hat to you, isn’t it? 对你来说，这其中大部分很可能是陈年老套了，是不是？
Examples from the Corpus
old hat• The movie's special effects now seem rather old hat.ˌold ˈhat adjectiveChineseSyllable
something if is lot a Corpus of hat, old
old hat
ˌold ˈhat
adjective [not before noun]
if something is old hat, a lot of people have said or done the same thing before and it is therefore not new or interesting:
Most of this is probably old hat to you, isn’t it?
ˌold ˈhat
adjective [not before noun]if something is old hat, a lot of people have said or done the same thing before and it is therefore not new or interesting: