Verb keep in line has 1 sense
  1. manipulate, keep in line, control - control (others or oneself) or influence skillfully, usually to one's advantage; "She manipulates her boss"; "She is a very controlling mother and doesn't let her children grow up"; "The teacher knew how to keep the class in line"; "she keeps in line"
    --1 is one way to interact
    Sample sentences:
    Somebody ----s something
    Somebody ----s somebody
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