the.com/harbour

means A sheltered stretch of water where ships can moor safely, protected from open sea and storm — and by extension, any place that shelters or holds something, like a harboured grudge or a harboured secret.

from From Old English 'herebeorg,' a compound of 'here' (army, host) and 'beorg' (shelter, refuge) — so literally a lodging for an army or travelers. It passed through Old Norse-influenced Middle English as 'herberwe/harbor,' meaning any shelter or inn before the sense narrowed to a haven specifically for ships. The verb sense — to harbour a fugitive, a thought, a grudge — kept the older, broader meaning of simply giving something a place to stay.