大才小用

lit. making little use of great talent / to use a sledgehammer to crack a nut

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

ability / talent / sb of a certain type / a capable individual / then and only then / just now / (before an expression of quantity) only

(variant of 才[cai2]) just now / (before an expression of quantity) only

small / tiny / few / young

to use / to employ / to have to / to eat or drink / expense or outlay / usefulness / hence / therefore