furrow - definition and synonyms

verb 

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/ˈfʌrəʊ/
present tense
I/you/we/theyfurrow
he/she/itfurrows
present participlefurrowing
past tensefurrowed
past participlefurrowed
  1. 1
    [intransitive/transitive] if your brow furrows, or if you furrow it, deep lines appear on your forehead, for example because you are concentrating or worrying
  2. 2
    [transitive] to make a deep line in something