spread oneself too thin
Overextend oneself, undertake too many different enterprises. For example, Ashish’s exhausted; what with work, volunteer activities, and social life he’s spread himself too thin. This expression alludes to smearing something (like butter on bread) in such a thin layer that it does not cover the surface.
Taken from source (except for a minor name change)
Serendipity ‘eh?
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