The phrase 'poke holes in' is a common idiom that refers to finding flaws or weaknesses in an argument, idea, or plan. There are several synonyms for this expression that may come in handy while writing or speaking. Some of the phrases that convey a similar meaning include, 'pick apart,' 'critique,' 'debunk,' and 'dissect.' Additionally, terms like 'expose,' 'show the cracks in,' and 'disprove' can also be used to signify the same concept. These words help to add depth to our language and enable us to express our thoughts more precisely. It's always valuable to have a varied and rich vocabulary to articulate our ideas and thoughts effectively.