WordWeb Online

1. Be or come between
   "An interposing thicket blocked their way"
    
2. Introduce
   "God interposed death"
    
3. To insert between other elements
   "She interposed clever remarks";
   - interject, come in, put in, throw in, inject
    
4. Get involved, so as to alter or hinder an action, or through force or threat of force
   "Why did the U.S. not interpose earlier in WW II?";
   - intervene, step in, interfere

Derived forms: interposes, interposed, interposing

Type of: break up, cut off, disrupt, interact, interrupt, introduce