sub for

sub for (someone or something)

1. To act as a substitute for someone or something. ("Sub" is an abbreviation of "substitute.") I'm subbing for Eric for the next few days while he recovers in the hospital. Don't believe anyone who tries to convince you that low-fat cooking sprays can sub for real butter or olive oil and not taste any different.
2. To use, employ, or instruct someone or something to act as a substitute for someone or something else. In this usage, a noun or pronoun is used between "sub" and "for." With a healthy 30-point lead, the coach subbed the rookie for the star quarter back to give him some experience on the field. Let's try subbing an AC motor for the DC one we've been using and see if that improves the results.
See also: sub
Farlex Dictionary of Idioms.

sub someone for (someone else)

 and sub something for something else
to substitute someone for someone else or something for something else. I will sub Chuck for Roger for this next play only. We will sub the red ones for the blue ones.
See also: sub

sub for someone or something

to substitute for someone or something. I have to sub for Roger at work this weekend. Will pliers sub for the wrench you wanted?
See also: sub
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • sub for (someone or something)
  • substitute for
  • substitute for (someone or something)
  • sub in (for someone or something)
  • swap in (for someone or something)
  • in place of
  • in place of (someone or something)
  • in place of somebody/something
  • replace (someone or something) with (someone or something)
  • replace by
References in periodicals archive
And as Sandra Nelson, a sub for the past seven years in Aldine.