丢开 is a resultative verb compound (离合词) made of 丢 (to throw, to lose) and 开 (away, off) as the resultative complement. It can mean 'to discard' something physical, or more commonly 'to set aside' a topic or thought for the time being. The verb is separable: you can insert 得 or 不 between the two characters to show potential (丢得开 'can be set aside', 丢不开 'cannot be set aside'), or insert 了 to show completion (丢开了 'have set aside'). For learners, note that the object often appears before the verb in a 把 construction or after the whole compound.