Throw off is a phrasal verb that means to eliminate, discard, or get rid of something. There are numerous synonyms that can be used in place of throw off, depending on the context and intended meaning. Some of these include 'cast off', 'shed', 'slough off', 'ditch', 'jettison', 'eject', 'expel', 'banish', 'discharge', 'eject', 'rid', 'unburden', 'purge', 'scrap', 'dismantle', 'dispose of', 'eliminate', 'discard', 'remove', 'cast out', 'shake off' and many others. Choosing the right synonym depends on the situation, as context determines the best option.