Synonyms: deputise, deputize, step in, substitute
Definition: act as a substitute
Usage: She stood in for the soprano who suffered from a cold
Similar words: supercede, supersede, supervene upon, supplant, replace
Definition: take the place or move into the position of
Usage: Smith replaced Miller as CEO after Miller left; the computer has supplanted the slide rule; Mary replaced Susan as the team's captain and the highest-ranked player in the school
Synonyms: interfere, interpose, intervene, step in
Definition: get involved, so as to alter or hinder an action, or through force or threat of force
Usage: Why did the U.S. not intervene earlier in WW II?
Similar words: interact
Definition: act together or towards others or with others
Usage: He should interact more with his colleagues