From Longman Dictionary of Contemporary Englishcommiseratecom‧mis‧e‧rate /kəˈmɪzəreɪt/ verb [intransitive + with] formalSYMPATHIZEto express your sympathy for someone who is unhappy about something→ See Verb table
Examples from the Corpus
commiserate• In several of their letters, Hartley and Burns, commiserated about the problems of old age.• The programme was filmed in front of a live audience who had to clap, laugh and commiserate in all the appropriate places.• 'Poor Alistair!' she commiserated. 'Let me buy you lunch.'• When he failed his driving test, I called him up and commiserated with him.• I commiserate with my hon. Friend on his misfortune this evening, in finding himself inadvertently supporting us in the Lobby.• I just wanted to commiserate with you.