Now you have got me looking up the derivation and (call me sad) I think it is quite interesting, especially the connection with "grounds for suspicion"
Late Middle English (in umbrage): from Old French, from Latin umbra shadow. An early sense was 'shadowy outline', giving rise to 'ground for suspicion', whence the current notion of 'offence '
Orchids and other lovely plants that don’t need a lot of attention

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