1. to return to sth that has previously caused difficulty or harm
get back on the horse after an accident
To 'get back on the horse' means to go back to doing something that has previously failed. Similar in meaning to 'get back in the saddle' and 'get back up again'. This is an idiomatic expression used in situations where you want to encourage someone to try again or not to give up. Can be used in social and professional contexts.