fixate

/F IH1 K S EY0 T/
verb
  1. 1

    To make something fixed and stable; to fix.

  2. 2

    To stare fixedly at something.

  3. 3

    To attend to something to the exclusion of all others; used with on.

  4. 4

    To attach oneself to a person or thing in a pathological or neurotic manner; used with on.

Source: https://en.wiktionary.org/wiki/fixate