There are several synonyms for the phrase "draw down upon." Some of these synonyms include "pull down upon," "bring upon," "attract," "invoke," and "summon." All of these synonyms refer to a situation where someone or something is being brought or attracted to a particular location or situation. When using any of these synonyms, it's essential to use them in context to convey the intended meaning accurately. For example, one might say "He pulled down upon the curtains, blocking out the sun" to convey that someone has closed the curtains to block out light. So, using synonyms can help add variety and freshness to the language and convey the intended meaning more effectively.