"Sieve out" is a common phrase used to describe a filtering or separating process. There are many synonyms that could be used instead of "sieve out," including "sort," "filter," "cull," "screen," "sift," "strain," and "winnow." These terms are often used in various fields such as cooking, chemistry, and biology. For example, chefs use a sieve to strain soup or pasta water, while scientists use a filter paper to separate mixtures in a laboratory setting. "Sieve out" is a versatile phrase that can be replaced with several words, depending on the context and the kind of separation that is being done.