► 動詞へたる  [(2)へたる]    
meaning:  wear out  rank: 3☆ 
布団の
中心部が
ヘタってしまった ⇨ The mattress has sagged in the middle  
(☛ Things to lose their original shapes and elasticity after extended use)へたる  [(2)へたる]  [coll]    
meaning:  tire  rank: 4☆ 
余りの
暑さにへたった ⇨ I got worn out from the extreme heat