The phrase "be sainting" has no commonly established synonyms or equivalents. This may be due to its colloquial nature and limited usage. However, the meaning of "be sainting" is similar to phrases like "acting saintly," "feigning piety," or "putting on a facade of righteousness." These expressions describe a person who is pretending to be more virtuous or holy than they really are. It is important to note that these synonyms are not exact replacements for "be sainting," but they convey similar ideas and can be used in similar contexts.