IDIOM ►
pinch hit for someone
Meaning 1 ►▼
to substitute for someone
Sentence 1
We need a run. John, will you pinch hit for the pitcher?
Meaning 2 ►▼
to substitute for someone
Sentence 2
Mary, will you please pinchhit for John on this account, while he is on vacation?
Derivation
A batter who is not in the lineup for a particular date can pinch hit for another batter.