decipher - definition and synonyms

verb [transitive] 

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/dɪˈsaɪfə(r)/
present tense
I/you/we/theydecipher
he/she/itdeciphers
present participledeciphering
past tensedeciphered
past participledeciphered
  1. 2
    to succeed in understanding the meaning of something written in a secret system of letters or symbols called a code
  2. 3
    to understand something mysterious or confusing

    The look he gave her was hard to decipher.