A person or thing that approaches; one who comes near or draws closer to something.
From 'approach' plus the agent suffix '-er' (one who does the action). Standard English word formation, but less commonly used than 'approach' itself, since the action is more frequently discussed than the agent performing it.
Approacher is grammatically valid but practically rare—we say 'he approaches' rather than 'he is an approacher,' which reveals how English prefers verb forms for active situations but reserves '-er' words for habitual roles (like teacher, builder, dancer).
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