To make contact with something or someone; to affect emotionally; or a slight amount or quality of something.
From Old French 'tochier,' probably from Celtic origin. Originally meant to strike or hit, then broadened to any physical contact and metaphorical contact (emotional impact).
Neuroscience shows that touch is our most basic sense—when you 'touch' someone emotionally, you're activating the same brain regions that detect physical touch, which is why feeling and touching share the same word in many languages.
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