lose/keep trace/track (of)
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English Expression:
  1.   Keep close watch on
  2. n.  lose/keep trace/track (of)
  3. n.  on guard/the watch
  4. n.  direct one's attention to
  5. n.  keep one's eyes peeled
  6. n.  keep one's eyes skinned
  7. n.  keep both eyes open
  8. n.  keep both eyes peeled
  9. n.  keep both eyes skinned
  10. n.  keep one's weather eye open (=keep a weather eye on)
  11. n.  keep one's weather eye open (=keep a weather eye out for)
  12. n.  have one's weather eye open (=keep a weather eye on)
  13. n.  have one's weather eye open (=keep a weather eye out for)
  14. n.  keep [take] a sharp [keen] lookout for
  15. n.  keep (a)close [careful] watch on