Sopia means “to fit” or also to “to suit” both in concrete and abstract sense.

“Sopiiko paita sinulle?” “Onko se sopiva?” /
“Does the shirt fit to you? Is it suitable?”
“Tuo puku sopii sinulle hyvin.” /
“That suit suits you well.”

It can refer to other suitable/unsuitable things as well, not only clothes:

“Sopiiko perjantai sinulle?” / “Does Friday suit you?” (lit. “for you”)

If something “suits you” then you “agree to it”, that’s why “sopia” means also “to agree” in Finnish.

Teidän pitää sopia riitanne! / “you must come to an agreement.”

The noun derived from it is “sopimus“, which means any kind of agreement, pact, treaty or contract (written or oral).
Allekirjoitin vuokrasopimuksen vuokranantajan kanssa. /
I signed a rental contract with my landlord.

Pariisin rauhansopimus päätti toisen maailmansodan./
The Paris Peace Treaty concluded the Second World War.

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