substitute for (?.)
- act for
- answer for
- appear for
- back up
- change places with
- commission
- crowd out
- cut out
- deputize
- displace
- double for
- fill in for
- front for
- ghost
- ghostwrite
- pinch-hit
- pinch-hit for
- relieve
- replace
- represent
- speak for
- spell
- spell off
- stand in for
- subrogate
- succeed
- supersede
- supplant
- swap places with
- understudy
- understudy for