threadbare
adjective uk/ˈθred.beər/ us/ˈθred.ber/
(THIN)
（织物或衣服）磨光露底的，穿旧的
Threadbare material or clothes have become thin or damaged because they have been used a lot.
a threadbare coat 磨破的外套
(WEAK)
（借口、论点或想法）陈旧的，老一套的
A threadbare excuse, argument, or idea is not strong and no longer persuades people because it is old or has been used too much.
a threadbare excuse 老掉牙的借口